Class   451	ABRADING
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PRECISION DEVICE OR PROCESS - OR WITH CONDITION RESPONSIVE CONTROL

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. (1 indent ) Condition responsive control for sandblasting

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.. (2 indent ) Cyclic control

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. (1 indent ) Tape controlled

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. (1 indent ) Computer controlled

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. (1 indent ) By optical sensor

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. (1 indent ) Controlling temperature

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. (1 indent ) With indicating

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.. (2 indent ) Of tool or work holder position

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.. (2 indent ) And feeding of tool or work holder

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. (1 indent ) With feeding of tool or work holder

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.. (2 indent ) And use of moving abutment

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... (3 indent ) Moved by cam

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.. (2 indent ) Screw actuated

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... (3 indent ) Manually adjustable

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... (3 indent ) Ratchet and pawl drive

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.... (4 indent ) Sizing gauge controlled

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.... (4 indent ) Cam actuated

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.... (4 indent ) Hydraulically driven

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.... (4 indent ) Table dog actuated

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.. (2 indent ) Tool wear compensation

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... (3 indent ) Sizing gauge controlled

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.. (2 indent ) Cam actuated

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.. (2 indent ) Hydraulically driven

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... (3 indent ) Sizing gauge controlled

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... (3 indent ) Control means near and parallel to the abrader

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.. (2 indent ) Tool interior of workpiece

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ABRADING PROCESS

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. (1 indent ) Utilizing shield (mask or stencil)

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.. (2 indent ) With in situ removal of nonresist portion of shield

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.. (2 indent ) With preparation of shield

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. (1 indent ) Tumbling

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.. (2 indent ) Including temperature modification or control

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.. (2 indent ) In at least one of plural abrading steps

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.. (2 indent ) With auxiliary work treating or in critical fluent medium

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. (1 indent ) Utilizing fluent abradant

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.. (2 indent ) Combined abrading

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.. (2 indent ) By blasting

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... (3 indent ) With nonsiliceous abradant

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... (3 indent ) With nonatmospheric fluid carrier

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. (1 indent ) Glass or stone abrading

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.. (2 indent ) Lens

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... (3 indent ) Edging

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.. (2 indent ) Edging

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. (1 indent ) Razor, knife, or scissors sharpening

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. (1 indent ) Gauge abrading

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. (1 indent ) Gear or worm abrading

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. (1 indent ) Drill, thread, thread cutter, reamer, or rotary cutter abrading

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. (1 indent ) Roll, roller, shaft, ball, or piston abrading

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.. (2 indent ) Ball abrading

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. (1 indent ) Ring, tube, bushing, sleeve, or cylinder abrading

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.. (2 indent ) Bearing raceway

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. (1 indent ) With critical temperature modification or control of work or abradant

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. (1 indent ) With critical nonabrading work treating

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.. (2 indent ) Deforming

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. (1 indent ) With tool treating or forming

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. (1 indent ) Combined abrading

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.. (2 indent ) Utilizing mounted rigid abrading tool only

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. (1 indent ) Utilizing nonrigid tool

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. (1 indent ) Abradant supplying

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. (1 indent ) Hollow work

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. (1 indent ) Cam

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. (1 indent ) Side face of disk

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MACHINE

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. (1 indent ) Combined

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.. (2 indent ) Scouring or polishing means

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.. (2 indent ) With nonabrading means

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... (3 indent ) Work deformer

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... (3 indent ) Cutter

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.... (4 indent ) Including abrader for cut surface

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.... (4 indent ) Drill

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... (3 indent ) Having means to refurbish abrading tool

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... (3 indent ) Adjunct

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. (1 indent ) Graining box

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. (1 indent ) Sandblast

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.. (2 indent ) Hollow interior work

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.. (2 indent ) Spark plug

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.. (2 indent ) Electrical device

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.. (2 indent ) File

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.. (2 indent ) Having moving work holder

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... (3 indent ) Endless belt type

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... (3 indent ) Rotary

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.... (4 indent ) Rollers

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.... (4 indent ) Table

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.. (2 indent ) Having tumbling barrel

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... (3 indent ) And centrifugal particle propulsion means

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.. (2 indent ) Having particle recovery means

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... (3 indent ) And separation means

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.. (2 indent ) Having sandblast chamber

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.. (2 indent ) Having hand-directed sandblast nozzle

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.. (2 indent ) Abradant propulsion means

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... (3 indent ) Mobile machine

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... (3 indent ) Magnetic

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... (3 indent ) Mechanical

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.... (4 indent ) Centrifugal batter with abradant supply

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....• (5 indent ) Powered abradant supply

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... (3 indent ) Centrifugal batter

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... (3 indent ) Vane structure

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.. (2 indent ) Abradant supply structure

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... (3 indent ) Multiple hopper

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.. (2 indent ) Valve structure

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.. (2 indent ) Sandblast nozzle structure

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. (1 indent ) Scouring device

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.. (2 indent ) Immersion

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... (3 indent ) Roller work feed

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... (3 indent ) Rotary work holder

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... (3 indent ) Drawing reel

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.. (2 indent ) Reciprocating scouring tool

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.. (2 indent ) Rotary cylindrical scouring tool

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... (3 indent ) Opposed pair of scouring tools

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.. (2 indent ) Rotary disk-shaped scouring tool

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... (3 indent ) Opposed pair of scouring tools

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. (1 indent ) Immersion

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. (1 indent ) By use of plural work holders, without tool

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.. (2 indent ) Of valve and seat

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... (3 indent ) Plug cock

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... (3 indent ) Poppet valve

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... (3 indent ) Slide valve

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. (1 indent ) Rotary reciprocating tool

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.. (2 indent ) Cylindrical tool

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... (3 indent ) Oscillating

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.... (4 indent ) Harvester knife

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.... (4 indent ) Work rotating

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... (3 indent ) Rectilinear

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.... (4 indent ) Pattern and follower driver

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.... (4 indent ) Blade reversing (e.g., razor blade)

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.... (4 indent ) Compound rectilinear motion

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.... (4 indent ) Harvester knife

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.... (4 indent ) One-way work cut

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.... (4 indent ) One-way work traverse

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....• (5 indent ) Roller work feed

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.... (4 indent ) Opposed

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....• (5 indent ) Reciprocating work holder

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....• (5 indent ) Rotating work holder

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.... (4 indent ) Planetary

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.... (4 indent ) Reciprocating work holder

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....• (5 indent ) Rectilinear

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....• (5 indent ) Rocking

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.... (4 indent ) Swinging tool carrier

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.... (4 indent ) Work rotating

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....• (5 indent ) Helical blade

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....• (5 indent ) Cylindrical surface (e.g., roll) abrader

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....• (5 indent ) Rotary work holder

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....•. (6 indent ) Pattern and follower driver

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....•. (6 indent ) Hydraulic driver

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....•. (6 indent ) Disk or wheel abrader

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....•. (6 indent ) Gear abrader

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....•.. (7 indent ) Hob

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....•. (6 indent ) Turret

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.... (4 indent ) Rectilinearly reciprocating tool carriage

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....• (5 indent ) Hydraulic driver

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....• (5 indent ) Screw and nut driver

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....• (5 indent ) Flexible driver

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....• (5 indent ) Rack and pinion driver

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.... (4 indent ) Reciprocating spindle

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....• (5 indent ) Hydraulic driver

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....• (5 indent ) Cam and follower driver

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.. (2 indent ) Disk tool

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... (3 indent ) Oscillating

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... (3 indent ) Rectilinear

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.... (4 indent ) Gear abrader

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. (1 indent ) Reciprocating tool

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.. (2 indent ) Oscillating

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.. (2 indent ) Rectilinear

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... (3 indent ) Ultrasonic

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... (3 indent ) Compound rectilinear motion

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... (3 indent ) Endless work carrier

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... (3 indent ) Flexible strip or endless band tool

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.... (4 indent ) Stropping machine

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... (3 indent ) Reciprocating work holder

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.... (4 indent ) Rocking

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... (3 indent ) Roller work feed

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... (3 indent ) Rotary work holder

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... (3 indent ) Swinging tool carrier

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.... (4 indent ) Having actuating handle

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... (3 indent ) Drawing reel

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. (1 indent ) Rotary tool

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.. (2 indent ) Rotary cylinder

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... (3 indent ) Linear indexing of the tool

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... (3 indent ) Internal

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.... (4 indent ) Abrading crank-pin

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... (3 indent ) One-way work traverse

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.... (4 indent ) Drawing reel

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.... (4 indent ) Endless work carrier

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....• (5 indent ) Blade sharpener

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.... (4 indent ) Nut and screw

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....• (5 indent ) Blade sharpener

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.... (4 indent ) Roller work feed

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....• (5 indent ) Work rotating

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.... (4 indent ) Opposed abrading tools

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....• (5 indent ) Razor blade

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....• (5 indent ) Blade sharpener

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.... (4 indent ) Blade sharpener

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... (3 indent ) Opposed abrading tools

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.... (4 indent ) Alternating tools

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....• (5 indent ) Blade sharpener

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.... (4 indent ) Plunger infeeder

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....• (5 indent ) Blade sharpener

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.... (4 indent ) Reciprocating work holder

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....• (5 indent ) Rectilinear

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....•. (6 indent ) Rocking

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....•.. (7 indent ) Blade sharpener

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....•. (6 indent ) Blade sharpener

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....• (5 indent ) Rocking

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....•. (6 indent ) Blade sharpener

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....• (5 indent ) Blade sharpener

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.... (4 indent ) Roller work feed

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....• (5 indent ) Blade sharpener

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.... (4 indent ) Work rotating

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....• (5 indent ) Rotary work holder

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... (3 indent ) Planetary

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... (3 indent ) Reciprocating work holder

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.... (4 indent ) Rectilinear

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....• (5 indent ) Indexing

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....• (5 indent ) Compound

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....• (5 indent ) Rocking

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....•. (6 indent ) Hob, tap, or fluted thread

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....• (5 indent ) Work rotating

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....•. (6 indent ) Gear forming

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....•. (6 indent ) Long helix

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....•. (6 indent ) Rotary work holder

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....•. (6 indent ) Thread abrader

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....•.. (7 indent ) Including work support engaging work at opposite, axial ends; e.g., opposed "centers"

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....• (5 indent ) Blade sharpener

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....• (5 indent ) Harvester knife

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.... (4 indent ) Rocking

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....• (5 indent ) Work rotating

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....•. (6 indent ) Noncircular cross section

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.... (4 indent ) Blade sharpener

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.... (4 indent ) Harvester knife

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... (3 indent ) Stationary work holder

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.... (4 indent ) Reversing, obverting, or pivoting

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.... (4 indent ) Spaced portions

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.... (4 indent ) Blade sharpener

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.... (4 indent ) Harvester knife

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... (3 indent ) Swinging tool carrier

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... (3 indent ) Templet

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.... (4 indent ) Pantograph

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.... (4 indent ) Rotary templet or pattern

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....• (5 indent ) Lens abrader

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... (3 indent ) Work guide

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... (3 indent ) Work rotating

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.... (4 indent ) With "dead" center

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.... (4 indent ) Work handling

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.... (4 indent ) Through feed

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.... (4 indent ) Rotary work holder

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....• (5 indent ) Turret

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....•. (6 indent ) Blade sharpener

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....• (5 indent ) Spaced abrading areas

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....• (5 indent ) By hob

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....• (5 indent ) Abrading eccentric shape

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....• (5 indent ) Valve abrader

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....• (5 indent ) Gear abrader

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....• (5 indent ) Disk or wheel abrader

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....•. (6 indent ) Lens abrader

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....• (5 indent ) Lens abrader

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....• (5 indent ) Glassware ornamenting

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.... (4 indent ) Disk or wheel abrader

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.. (2 indent ) Rotary disk

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... (3 indent ) One-way work traverse

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.... (4 indent ) Opposed abrading tools

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... (3 indent ) Opposed abrading tools

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.... (4 indent ) Blade reversing

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.... (4 indent ) Reciprocating work holder

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....• (5 indent ) Rectilinear

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....• (5 indent ) Rocking

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.... (4 indent ) Work guide

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.... (4 indent ) Work rotating

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....• (5 indent ) Rotary work holder

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... (3 indent ) Orbital

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.... (4 indent ) Planetary

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... (3 indent ) Reciprocating work holder

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.... (4 indent ) Rectilinear

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....• (5 indent ) Work rotating

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....•. (6 indent ) Gear generating

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.... (4 indent ) Rocking

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....• (5 indent ) Lens abrader

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... (3 indent ) Stationary work holder

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.... (4 indent ) Reversing, obverting, or pivoting

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... (3 indent ) Swinging tool carrier

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... (3 indent ) Templet

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... (3 indent ) Work guide

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... (3 indent ) Work rotating

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.... (4 indent ) Raceway

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.... (4 indent ) Rotary work holder

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....• (5 indent ) By means loosely confining work

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....• (5 indent ) Planar surface abrading

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....•. (6 indent ) Having pressure plate

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....• (5 indent ) Having vacuum or adhesive securing means

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....• (5 indent ) Disk or wheel abrader

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....• (5 indent ) Planetary

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....• (5 indent ) Turret

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... (3 indent ) Blade sharpener

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.. (2 indent ) Means to rotate tool

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... (3 indent ) Hydraulic driver

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. (1 indent ) Endless band tool

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.. (2 indent ) Belt tracking

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.. (2 indent ) Chain

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.. (2 indent ) One-way work traverse

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... (3 indent ) Endless work carrier

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... (3 indent ) Roller work feed

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.. (2 indent ) Opposed endless band abrading tools

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.. (2 indent ) Presser or former

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.. (2 indent ) Reciprocating band carrier

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.. (2 indent ) Reciprocating work holder

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... (3 indent ) Work rotating

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.. (2 indent ) Rotary work holder

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... (3 indent ) Turret

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.. (2 indent ) Superposed endless band tools

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.. (2 indent ) Swinging band carrier

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.. (2 indent ) Tension device

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. (1 indent ) Stationary tool

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.. (2 indent ) Flexible

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... (3 indent ) Reciprocating work holder

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.... (4 indent ) Needle-eye polisher

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.... (4 indent ) Stropping machine

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... (3 indent ) Work rotating

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.... (4 indent ) Stropping machine

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.. (2 indent ) Rigid

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... (3 indent ) Reciprocating work holder

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.... (4 indent ) Blade sharpener

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....• (5 indent ) Blade reversing

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.... (4 indent ) Lens abrader

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... (3 indent ) Rotary work holder

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.... (4 indent ) Lens abrader

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. (1 indent ) Tumbling device

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.. (2 indent ) Rotating work about vertical axis

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.. (2 indent ) Drum

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... (3 indent ) Planetary

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.. (2 indent ) Tumbling shapes

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WORK FEEDER

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. (1 indent ) Rotary

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.. (2 indent ) With hopper or magazine

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. (1 indent ) Reciprocating

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.. (2 indent ) With hopper or magazine

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. (1 indent ) Endless

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.. (2 indent ) With hopper or magazine

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. (1 indent ) Skewed feed rollers

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. (1 indent ) Ejector or unloader

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FRAME OR MOUNT

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. (1 indent ) Double treadle

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. (1 indent ) For hanging rigid, rotary abrading tool

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.. (2 indent ) With balancing provision

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. (1 indent ) Portable abrader

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.. (2 indent ) Button cleaner

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.. (2 indent ) Calk sharpener

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.. (2 indent ) Rail abrader

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.. (2 indent ) Roll or wheel abrader

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.. (2 indent ) Edge-tool sharpener

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.. (2 indent ) Floor surfacing machine

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... (3 indent ) Reciprocating tool

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... (3 indent ) Rotary cylinder tool

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... (3 indent ) Rotary disk tool

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.. (2 indent ) Wall surfacing machine

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.. (2 indent ) Endless band tool

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.. (2 indent ) Reciprocating tool

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.. (2 indent ) Orbital motion tool

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.. (2 indent ) Rotary cylinder tool

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.. (2 indent ) Rotary disk tool

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. (1 indent ) Rotary tool supporter

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.. (2 indent ) Floor or bench stand

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.. (2 indent ) Turret

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.. (2 indent ) Machine head

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WORK HOLDER

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. (1 indent ) Clamp

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.. (2 indent ) Work oscillating

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.. (2 indent ) Edge tool

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... (3 indent ) Seat controlled

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... (3 indent ) Gauging device

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.... (4 indent ) Portable

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....• (5 indent ) Blade sharpener

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... (3 indent ) Harvester knife

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.... (4 indent ) Suspension

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... (3 indent ) Rotary cutter

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.... (4 indent ) Drill

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....• (5 indent ) Pattern control

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... (3 indent ) Work reciprocating

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... (3 indent ) Portable

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... (3 indent ) Work rotating

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... (3 indent ) Angularly adjustable

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.. (2 indent ) Hollow work

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... (3 indent ) Hypodermic needle

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.. (2 indent ) Skate

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.. (2 indent ) Lens holder

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.. (2 indent ) Work rotating

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.. (2 indent ) Portable

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.. (2 indent ) Angularly adjustable

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. (1 indent ) Vacuum

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. (1 indent ) Drop or dop stick

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. (1 indent ) Lens or prism

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. (1 indent ) Portable

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. (1 indent ) Work reciprocating

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.. (2 indent ) Rectilinearly

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... (3 indent ) And work rotating

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... (3 indent ) Hydraulically actuated

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.. (2 indent ) Rocking

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. (1 indent ) Work rotating

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.. (2 indent ) Rotary work holder

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... (3 indent ) Crank shaft

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... (3 indent ) Orbital movement

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... (3 indent ) Turret

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. (1 indent ) Rotary

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. (1 indent ) Indexing

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.. (2 indent ) Hand operated

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. (1 indent ) Angularly adjustable

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WORK REST

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. (1 indent ) For centerless abrader

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. (1 indent ) Steady rest

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. (1 indent ) Tool tooth rest

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. (1 indent ) Gauging device

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WORK TABLE

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. (1 indent ) Glass work

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. (1 indent ) Work rotating

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. (1 indent ) Angularly adjustable

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ATTACHMENT

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. (1 indent ) To textile machine to abrade card

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.. (2 indent ) Flat card

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. (1 indent ) To electrical machine to abrade commutator

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. (1 indent ) To cutting machine to sharpen blade

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.. (2 indent ) Rotary abrading tool

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... (3 indent ) Rotary reciprocating tool

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... (3 indent ) Work actuated

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.. (2 indent ) Stationary abrading tool

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. (1 indent ) Roll or wheel abrader

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.. (2 indent ) Rotary reciprocating tool

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.. (2 indent ) Reciprocating tool

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... (3 indent ) Nut-and-screw-type drive

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.. (2 indent ) Stationary abrading tool

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. (1 indent ) To rail

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. (1 indent ) Valve or valve seat abrader

431

.. (2 indent ) Orbital tool

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. (1 indent ) To sewing machine

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.. (2 indent ) To be driven by flywheel

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. (1 indent ) To vehicle

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. (1 indent ) To lathe

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.. (2 indent ) Center abrader

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.. (2 indent ) Internal abrader

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. (1 indent ) To work guide

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. (1 indent ) To the work

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. (1 indent ) Internal abrader

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. (1 indent ) Orbital tool

442

ACCESSORY

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. (1 indent ) Dressing

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. (1 indent ) Tool cleaner

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. (1 indent ) Erasing shield

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. (1 indent ) Abradant supplying

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.. (2 indent ) Grader

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. (1 indent ) Button cleaning shield

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. (1 indent ) Cooling

450

.. (2 indent ) Wetting grindstone

451

. (1 indent ) Guard or housing

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.. (2 indent ) Breakage guard

453

.. (2 indent ) Collector

454

.. (2 indent ) Drive shield

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.. (2 indent ) Spark or splash guard

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.. (2 indent ) Suction

457

.. (2 indent ) Work guard

458

. (1 indent ) Abrading sheet applying device

459

. (1 indent ) Strop surface renewing

460

. (1 indent ) Work-mounting device

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COMBINED TOOL

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. (1 indent ) Internal

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CARRIER FOR RELATIVELY MOVABLE SIMULTANEOUSLY USABLE TOOLS

464

. (1 indent ) For radially movable tools

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.. (2 indent ) Centrifugal force urged tools

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... (3 indent ) Flexible flail tools

467

.... (4 indent ) With tool supply or storage

468

.... (4 indent ) Including self-sustaining tools

469

....• (5 indent ) With discrete nondestructible tool-securing means

470

.. (2 indent ) Including conoid or wedge tool moving member

471

... (3 indent ) With threaded operator

472

.... (4 indent ) To move conoid member

473

....• (5 indent ) To actuate pivotally mounted tools

474

....• (5 indent ) For movement of conoid members relative to each other

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....• (5 indent ) By conoid member with screw threads

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....• (5 indent ) Including plural conoid members

477

.... (4 indent ) Including key-way or spline

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... (3 indent ) Conoid member

479

.. (2 indent ) Including gear actuated tool mover

480

.. (2 indent ) Including lever actuated tool mover

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.. (2 indent ) Including hydraulically actuated tool mover

482

.. (2 indent ) Including thread actuated tool mover

483

... (3 indent ) Interrelated to move plural tools

484

.. (2 indent ) Including resiliently urged tool

485

... (3 indent ) By coil spring

486

. (1 indent ) Including tools resiliently urged toward work

487

CARRIER FOR A RADIALLY MOVABLE TOOL

488

VENTILATION OR COOLING OF TOOL OR TOOL SUPPORT

489

FLEXIBLE-MEMBER TOOL MOUNTED ON PLURAL ROLLS

490

TOOL SUPPORT FOR FLEXIBLE-MEMBER TOOL

491

. (1 indent ) With tool supply or storage

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.. (2 indent ) Coiled tool

493

... (3 indent ) On spool or axle

494

. (1 indent ) Having magnetic or suction tool holding means

495

. (1 indent ) Contour-adjustable support

496

. (1 indent ) Including tool holding slot in rotary tool support

497

.. (2 indent ) Separable along slot

498

... (3 indent ) Diametrically separable

499

.. (2 indent ) With tool tensioning means

500

... (3 indent ) By rotary gripping element

501

... (3 indent ) Including threaded element

502

. (1 indent ) Including longitudinal tool holding slot

503

.. (2 indent ) Separable along slot

504

. (1 indent ) Including expansible external surface

505

.. (2 indent ) Hydraulically actuated

506

.. (2 indent ) Centrifugally actuated

507

.. (2 indent ) Actuated by compression of support

508

. (1 indent ) Including headed, axially disposed, tool holding member on rotary support

509

.. (2 indent ) Tool holding member disconnected from support by partial rotation

510

.. (2 indent ) With threaded means to retain tool holding member

511

... (3 indent ) Including conical tool holding member

512

. (1 indent ) Including taper or wedge tool holding member

513

. (1 indent ) Including endless band tool holding member

514

. (1 indent ) Including resiliently urged tool holding member

515

.. (2 indent ) Separable

516

.. (2 indent ) Rotatable

517

.. (2 indent ) Biased for tool disengagement

518

.. (2 indent ) Cantilever-spring actuated

519

.. (2 indent ) Coil-spring actuated

520

. (1 indent ) Including tool holder having tool surface depressor

521

. (1 indent ) Including threaded means to retain tool holder

522

.. (2 indent ) Including bar or plate tool holding member

523

. (1 indent ) Manually manipulated

524

.. (2 indent ) By handle

525

... (3 indent ) Detachable from tool support

526

FLEXIBLE-MEMBER TOOL, PER SE

527

. (1 indent ) Interrupted or composite work face (e.g., cracked, nonplanar, etc.)

528

.. (2 indent ) Uniform thickness nonplanar

529

.. (2 indent ) Sectional

530

. (1 indent ) Work face variegated or on projecting backing

531

. (1 indent ) Splice or joint

532

. (1 indent ) Comprising fibers

533

. (1 indent ) Laminate

534

.. (2 indent ) Discontinuous or differential coating impregnation or bond

535

.. (2 indent ) Coil wound

536

.. (2 indent ) Integrated strands

537

.. (2 indent ) Non-coextensive laminae

538

.. (2 indent ) Strippable layer or component

539

.. (2 indent ) Abrasive on one surface only

540

RIGID TOOL

541

. (1 indent ) Rotary cylinder

542

.. (2 indent ) Circular segments

543

... (3 indent ) Detachable

544

.. (2 indent ) Laminated

545

.. (2 indent ) Work guide

546

.. (2 indent ) Reinforced

547

.. (2 indent ) Ribbed periphery

548

. (1 indent ) Rotary disk

549

.. (2 indent ) Work guide

550

.. (2 indent ) Disk laps

551

.. (2 indent ) Scroll

552

. (1 indent ) Stationary

553

.. (2 indent ) Metal

554

.. (2 indent ) Having oiler or moistener

555

.. (2 indent ) Work guide

556

.. (2 indent ) Razor hone

557

. (1 indent ) Having actuating handle

558

.. (2 indent ) Work guide

559

MISCELLANEOUS

	CROSS-REFERENCE ART COLLECTIONS

900

GEAR ABRADER

901

SUPER FINISH

902

BRAKE ABRADING

903

EGG CLEANING

904

FLEXIBLE ABRASIVE STORAGE REEL

905

METAL LAP

906

MACHINE ELEMENT OR UNIT

907

STRIP FEEDING

908

ELECTRICAL ABRADING

909

WIRE POLISHING

910

ULTRASONIC

911

TOOL MOUNTING POINT

912

SHOE ABRADING

913

CONTOUR ABRADING

914

SUPPORTING, POSITIONING, OR FEEDING WORK

915

ABRADING WHEEL SPEED CONTROL

916

ABRADING OF BRUSH BRISTLE

917

ABRADING OF SCALLOPED CUTTING EDGE (E.G., BREAD KNIFE SHARPENING)

918

ADJUSTABLE WORK SUPPORT (E.G., BY SINE BAR)

919

WANKEL

920

TIRE "ROUNDING"

921

"PAD" FOR LENS SHAPING TOOL

	FOREIGN ART COLLECTIONS

FOR000

CLASS-RELATED FOREIGN DOCUMENTS

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