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 Class   122LIQUID HEATERS AND VAPORIZERS
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  1R           PLANTS
  2           . (1 indent ) Garbage
  3           . (1 indent ) Motor vehicle
  1A           . (1 indent ) Air heaters
  1B           . (1 indent ) Once through
  1C           . (1 indent ) Feed water heaters
  4R           MISCELLANEOUS
  4A           . (1 indent ) Electric boiler
  4C           . (1 indent ) Water-cooled stoker
  4D           . (1 indent ) Catalyst
  5           GAS-PRODUCER
  5.51           AIR-INJECTED
  5.52           . (1 indent ) Combustion gas and vapor contact
  6R           INDUSTRIAL
  6.5           . (1 indent ) Port
  6.6           . (1 indent ) Tuyeres
  6.7           .. (2 indent ) Forge
  7R           . (1 indent ) Waste heat
  7A           .. (2 indent ) Steel converter
  7B           .. (2 indent ) Additional burner
  7C           .. (2 indent ) Waste sulfite
  7D           .. (2 indent ) Carbon monoxide
  8           . (1 indent ) Water firebox
  9           .. (2 indent ) Water tube type
  6A           . (1 indent ) Water-cooled walls
  6B           . (1 indent ) Bosh plates
  6C           . (1 indent ) Skew arch coolers
  10           FOR FLUID FUEL BURNER
  11           ROTARY
  12           ROTATABLY SUPPORTED
  13.01           STAND BOILER (E.G., WATER HEATER, ETC.)
  13.3           . (1 indent ) And delivery means to dispensing feature
  14.1           . (1 indent ) And condition responsive feature
  14.2           .. (2 indent ) Controls burner
  14.21           ... (3 indent ) By other than temperature of water
  14.22           ... (3 indent ) By temperature of water in a water containing chamber or external tank
  14.3           .. (2 indent ) Having water flow control feature
  14.31           ... (3 indent ) Using valve actuated by flow or pressure (e.g., check valve, etc.)
  15.1           . (1 indent ) Heated by liquid or steam (e.g., indirect heating, etc.)
  16.1           . (1 indent ) Solid fuel burner
  17.1           . (1 indent ) Fluid fuel burner
  17.2           .. (2 indent ) Liquid fuel burner
  18.1           .. (2 indent ) Having heat exchange feature
  18.2           ... (3 indent ) Preheater
  18.3           ... (3 indent ) Fire tube or flue surrounded by water containing chamber
  18.31           .... (4 indent ) Penetrates one side of water chamber to another
  18.4           ... (3 indent ) Water tube surrounded by burned fuel
  18.5           .. (2 indent ) And external water tank
  19.1           . (1 indent ) Water containing chamber or external tank having circulation feature within
  19.2           . (1 indent ) And casing feature for stand boiler or external water tank therefor
  20R           SUBSIDIARY
  20A           . (1 indent ) Subsidiary-heater firebox
  20B           . (1 indent ) Subsidiary-heater offtake flue
  29           ANNULAR FIREBOX
  30           MAGAZINE
             INDIRECTLY HEATED
             . (1 indent ) Separate fluid
  32           .. (2 indent ) Surface
  33           ... (3 indent ) Furnace
  34           ... (3 indent ) Separator
  31.1           INDIRECTLY HEATED SEPARATE INJECTED FLUID
  31.2           . (1 indent ) Submerged flame
  35           ACCUMULATOR
  36           AUXILIARY STEAM HEATER
  37           COMPARTMENT
             . (1 indent ) Auxiliary
  38           .. (2 indent ) Draft regulator
  39           FILM
  40           FLASHER
  41           . (1 indent ) Fluid fuel
  42           FIRE AND WATER TUBE
  43           . (1 indent ) Fluid fuel
  44.1           FIRE TUBE
  44.2           . (1 indent ) With baffle in flue
  49           . (1 indent ) Horizontal and vertical
             . (1 indent ) Horizontal or inclined
             .. (2 indent ) Water firebox
  50           ... (3 indent ) Flue
  51           . (1 indent ) Horizontal
  52           .. (2 indent ) Plural
  53           ... (3 indent ) Water tube
             .. (2 indent ) Central firebox
  54           ... (3 indent ) Double outlet
  55           .. (2 indent ) Cylinder
             .. (2 indent ) Depending fire tube
  56           ... (3 indent ) Rear of bridge wall
             .. (2 indent ) Double water firebox
  57           ... (3 indent ) Alternate smoke return
  58R           .. (2 indent ) Drop water firebox
  59           ... (3 indent ) Circulation conduit
             ... (3 indent ) Double
  60           .... (4 indent ) Alternate smoke return
  61           ... (3 indent ) Drop water baffle
  62           ... (3 indent ) Front and rear water baffle
  63           ... (3 indent ) Front water baffle
  64           ... (3 indent ) Interposed combustion chamber
  65           ... (3 indent ) Rear water baffle
  66           ... (3 indent ) Water coking chamber
             ... (3 indent ) Water grate
  67           .... (4 indent ) Intermediate draft
  68           ... (3 indent ) Water tube
             .... (4 indent ) Feed heater
  69           .... (5 indent ) Check-valved
  70           .... (4 indent ) Feeding air
  71           .... (4 indent ) Solid baffle
  58FB           ... (3 indent ) Fire box construction
  72           .. (2 indent ) Projecting into firebox
  73           ... (3 indent ) Drop water firebox
             .. (2 indent ) Return and reverse
  74           ... (3 indent ) Drop water firebox
  75           .. (2 indent ) Return fire tube
  76           ... (3 indent ) Drop water firebox
  77           .... (4 indent ) Internal water tube
             ... (3 indent ) Water firebox
  78           .... (4 indent ) Flue
  79           .. (2 indent ) Subjacent water arch
  80           .. (2 indent ) Subjacent flue
  81           .. (2 indent ) Subjacent transverse fire tube
             .. (2 indent ) Superjacent feed heater
  82           ... (3 indent ) In communication
  83           .. (2 indent ) Transverse diaphragm
             .. (2 indent ) Two diameters
  84           ... (3 indent ) Great diameter over firebox
  85           ... (3 indent ) Small diameter over firebox
  86           .... (4 indent ) Water firebox
  87           .. (2 indent ) U-coupling
  88           .. (2 indent ) Upper drum
             .. (2 indent ) Water arch
  89           ... (3 indent ) Rear of fire tube
  90           .. (2 indent ) Water firebox
             ... (3 indent ) Firebox water heater
  91           .... (4 indent ) Trapped circuit
  92           ... (3 indent ) Magazine
  93           ... (3 indent ) Offset
  94.1           .... (4 indent ) Water tube type
  95.1           ... (3 indent ) Plural with common combustion chamber
  95.2           .... (4 indent ) Multiboilers
  96           ... (3 indent ) Superposed
             ... (3 indent ) Water grate
  97           .... (4 indent ) Downdraft
  98           .... (4 indent ) Updraft
             ... (3 indent ) Water tube
  99           .... (4 indent ) Straddle
             ... (3 indent ) Water tube type
  100           .... (4 indent ) Interposed flue
  101           .. (2 indent ) Water smoke box
             .. (2 indent ) Water tube
             ... (3 indent ) Horizontal
  102           .... (4 indent ) Over bridge wall
  103           ... (3 indent ) Rear of fire tube
             ... (3 indent ) Rearwardly declined
  104           .... (4 indent ) Over bridge wall
             ... (3 indent ) Rearwardly inclined
  105           .... (4 indent ) Over bridge wall
  106           .. (2 indent ) Water wall
  107           ... (3 indent ) Drop water firebox
  108           ... (3 indent ) Subjacent water tube
  109           . (1 indent ) Inclined
             . (1 indent ) Transverse
  110           .. (2 indent ) Horizontal boiler
  111           .. (2 indent ) Vertical boiler
  112           ... (3 indent ) Water firebox
  113           .. (2 indent ) Water tube
  114           . (1 indent ) Vertical
  116           .. (2 indent ) Central fire dome
  117           .. (2 indent ) Central magazine
             .. (2 indent ) Circulation tube
  118           ... (3 indent ) Internal
  119           .. (2 indent ) Cylinder
  120           .. (2 indent ) Offset firebox
  121           .. (2 indent ) Return fire tube
  122           ... (3 indent ) Water firebox
  123           .. (2 indent ) Separate compartment
  124           .. (2 indent ) Side magazine
  125           .. (2 indent ) Top water chamber
  126           .. (2 indent ) Water firebox
  127           ... (3 indent ) Annular
  128           ... (3 indent ) Central magazine
             .. (2 indent ) Water grate
  129           ... (3 indent ) Downdraft
  130           .. (2 indent ) Water tube
  131           ... (3 indent ) Internal
  132           ... (3 indent ) Radial loop
  133           ... (3 indent ) Spur
  115           .. (2 indent ) Fluid fuel
  134           . (1 indent ) Volute
  46           . (1 indent ) Magazine
             . (1 indent ) Flue
  47           .. (2 indent ) Horizontal
  48           .. (2 indent ) Vertical
  45           . (1 indent ) Fluid fuel
  135.1           FLUE
  135.2           . (1 indent ) Alternative stack
  135.3           . (1 indent ) Sinusoidal flue
  136R           . (1 indent ) Horizontal
  137           .. (2 indent ) Plural
  138           ... (3 indent ) Water tube
  139           .. (2 indent ) Drop water firebox
  140.1           .. (2 indent ) Internal water tube
  140.2           ... (3 indent ) Having water tube in flue
             ... (3 indent ) Longitudinal
  141           .... (4 indent ) Drop water firebox
  142           ... (3 indent ) Return fire tube
  143           ... (3 indent ) Spur
  144           ... (3 indent ) Subjacent firebox
  145           ... (3 indent ) Transverse
  146           .... (4 indent ) Drop water firebox
  147           .... (4 indent ) Return fire tube
  148           ... (3 indent ) Water firebox
  149           .. (2 indent ) Return fire tube
  150           ... (3 indent ) Rear water tube
             ... (3 indent ) Water smoke box
  151           .... (4 indent ) Separate
  152           .. (2 indent ) Water grate in flue
  153           .. (2 indent ) Water tube
  154           ... (3 indent ) Over bridge wall
  136C           .. (2 indent ) Horizontal-corrugated or finned
  155.1           . (1 indent ) Vertical
  155.2           .. (2 indent ) With flue baffle
  155.3           .. (2 indent ) Having exterior heating flue
  155.4           .. (2 indent ) Having corrugated flue
  155.5           .. (2 indent ) Having undulating flue
  157           .. (2 indent ) Central magazine
  158           ... (3 indent ) Water jacket
             .. (2 indent ) Circulation tube
  159           ... (3 indent ) Internal
  160           .. (2 indent ) Concentric shell
  161           ... (3 indent ) Fluid fuel
  162           ... (3 indent ) Central magazine
  163           .. (2 indent ) Exterior drum
  165           .. (2 indent ) Internal water heater
  166.1           .. (2 indent ) With internal water tube
  166.2           ... (3 indent ) Loop-type tube
  168           ... (3 indent ) Central magazine
  169           ... (3 indent ) Coil
  170           .... (4 indent ) Header
  171           ... (3 indent ) Contracted inlet
  172           ... (3 indent ) Header
  173           ... (3 indent ) Horizontal spur
  174           ... (3 indent ) Internal fire tube
  175           ... (3 indent ) Offset water firebox
  176           ... (3 indent ) Transverse
  177           .... (4 indent ) Fluid fuel
  178           ... (3 indent ) Vertical aligned fire tube
  179           .... (4 indent ) Fluid fuel
  180           .... (4 indent ) Spur water tube
  181           ... (3 indent ) Vertical spur
  167           ... (3 indent ) Fluid fuel
  182.1           .. (2 indent ) With return fire tube
  182.2           ... (3 indent ) Having symmetrical arrangement of tubes
  182.3           ... (3 indent ) Having tubes offset from firebox
             .. (2 indent ) Spiral water conduit
  183           ... (3 indent ) Fluid fuel
             .. (2 indent ) Standpipe
             ... (3 indent ) Water tube
  184           .... (4 indent ) Annular firebox
  185           .... (4 indent ) Loop
  186           .... (4 indent ) Spur
  187           .. (2 indent ) Transverse fire tube
  164           .. (2 indent ) Insulated outlet flue
  156           .. (2 indent ) Fluid fuel
             HORIZONTAL CYLINDER
  188           . (1 indent ) Drop water baffle
             . (1 indent ) Offset subjacent firebox
  189           .. (2 indent ) Water roof
  190           .. (2 indent ) Water tube
             . (1 indent ) Subjacent fire tube
  191           .. (2 indent ) Beyond bridge wall
  192           . (1 indent ) Water bridge wall
  193           . (1 indent ) Water firebox
  194           .. (2 indent ) Water tube type
  195           . (1 indent ) Water tube
             .. (2 indent ) Feed heater
  196           ... (3 indent ) Check-valved
  197           .. (2 indent ) Lateral-longitudinal
  198           .. (2 indent ) Lateral-vertical
  199           ... (3 indent ) Firebox
  200           .. (2 indent ) Over fuel grate
  201           .. (2 indent ) Subjacent internal fire tube
  202           .. (2 indent ) Trapped circuit
             .. (2 indent ) Water grate
  203           ... (3 indent ) Downdraft
  204           ... (3 indent ) Intermediate draft
  205           ... (3 indent ) Multiple series
  206           ... (3 indent ) Solid and water bar
  207           ... (3 indent ) Updraft
             PLATE
             . (1 indent ) Zigzag conduit
  208           .. (2 indent ) Fluid fuel
  209.1           SECTIONAL
  209.2           . (1 indent ) Feeding air
  213           . (1 indent ) Plural firebox
             . (1 indent ) Horizontal sections
  214           .. (2 indent ) Superimposed
  215           ... (3 indent ) Central connection
  216           .... (4 indent ) Fluid fuel
  217           .... (4 indent ) Water firebox
  218           ... (3 indent ) Water firebox
  219           .... (4 indent ) Central magazine
             ... (3 indent ) Water tube
             .... (4 indent ) Internal fire tube
  220           .... (5 indent ) Water firebox
             . (1 indent ) Vertical sections
  221           .. (2 indent ) Annularly positioned
  222           ... (3 indent ) Central magazine
  223           .. (2 indent ) Longitudinally positioned
  224           ... (3 indent ) Casing
  225R           .. (2 indent ) Transversely positioned
  226           ... (3 indent ) Casing
  227           .... (4 indent ) Divided section
  228           ... (3 indent ) Divided section
  229           ... (3 indent ) Water grate
  225A           ... (3 indent ) Water heater in flue
  225B           ... (3 indent ) Water heater in boiler
  225F           ... (3 indent ) Feeding air
  230           .. (2 indent ) Two-section
  212.1           . (1 indent ) With magazine
  212.2           .. (2 indent ) With return or alternate flue
  211           . (1 indent ) Fluid or solid fuel
  210           . (1 indent ) Fluid fuel
  232           . (1 indent ) Water grate
  231           . (1 indent ) Accessories
             TANK
  233           . (1 indent ) Horizontal
  234           . (1 indent ) Vertical
  235.11           WATER TUBE
  235.12           . (1 indent ) Wall structure
  235.13           . (1 indent ) With fuel burners having posts and tuyeres
  235.14           . (1 indent ) Tube structure
  235.15           . (1 indent ) Headers and connections
  235.16           . (1 indent ) For plural fluids
  235.17           . (1 indent ) Having baffles
  235.18           . (1 indent ) Having seals
  235.19           . (1 indent ) D-type tube
  235.21           .. (2 indent ) Multiple D-type tubes
  235.22           . (1 indent ) Wall loop
  235.23           . (1 indent ) Having specific tube patterns
  235.24           . (1 indent ) Screens
  235.25           .. (2 indent ) Floor screens
  235.26           . (1 indent ) Having slag and ash disposal
  235.27           . (1 indent ) Locomotive-type
  235.28           . (1 indent ) Having rotary flame
  235.29           . (1 indent ) Having forced circulation system
  235.31           . (1 indent ) Having specific intenal drum and head structure
  235.32           . (1 indent ) With combustion
  235.33           . (1 indent ) With convection zone regulation
  235.34           . (1 indent ) With parallel multiple fireboxes
  235.35           . (1 indent ) With serial multiple fireboxes
  238           . (1 indent ) Offset firebox
  239           . (1 indent ) Superimposed firebox
  240.1           . (1 indent ) Having plural fireboxes
  240.2           .. (2 indent ) Series connected
  240.3           .. (2 indent ) Parallel connected
  241           . (1 indent ) Firebox in drum
  242           . (1 indent ) Capillary
  243           .. (2 indent ) Fluid fuel
             . (1 indent ) Coil or loop
  244           .. (2 indent ) Central standpipe
  245           ... (3 indent ) Fluid fuel
  246           ... (3 indent ) Annular firebox
  247           . (1 indent ) Coil
             .. (2 indent ) Horizontal
  248           ... (3 indent ) Fluid fuel
  249           .. (2 indent ) Vertical
  250R           ... (3 indent ) Fluid fuel
  250S           .... (4 indent ) Standpipe
  251           ... (3 indent ) Central magazine
  252           ... (3 indent ) Water firebox
  253           . (1 indent ) Cross
  254           .. (2 indent ) Over bridge wall
             .. (2 indent ) Over firebox
             ... (3 indent ) Longitudinal
             .... (4 indent ) Header
  255           .... (5 indent ) Drum
             ... (3 indent ) Transverse
             .... (4 indent ) Header
  256           .... (5 indent ) Drum
             .. (2 indent ) Transverse
             ... (3 indent ) Header
  257           .... (4 indent ) Drum
  258           . (1 indent ) Downflow
  259           . (1 indent ) Drum type
  260           . (1 indent ) Flat
  261           .. (2 indent ) Volute
  262           . (1 indent ) Horizontal
  263           .. (2 indent ) Over bridge wall
  264           .. (2 indent ) Over firebox
  265           . (1 indent ) Inclined
  266           . (1 indent ) Internal fire tube
  267           .. (2 indent ) Horizontal
  268           .. (2 indent ) Inclined
  269           .. (2 indent ) Plural fire tube
  270           .. (2 indent ) Straddle
  271           .. (2 indent ) Vertical
  272           ... (3 indent ) Central magazine
  273           . (1 indent ) Longitudinal upper drum
  274           .. (2 indent ) Fluid fuel
  275           . (1 indent ) Loop
  276           .. (2 indent ) Firebox enclosing
  277           .. (2 indent ) Over bridge wall
             .. (2 indent ) Over firebox
  278           ... (3 indent ) Cross
  279           ... (3 indent ) Horizontal
             ... (3 indent ) Rear of bridge wall
  280           .... (4 indent ) Bridge wall header
  281           ... (3 indent ) Standpipe
  282           ... (3 indent ) Vertical
  283           .... (4 indent ) Fluid fuel
             . (1 indent ) Over bridge wall
  284           .. (2 indent ) Headers at right angles
  285           .. (2 indent ) Transverse water baffle
             .. (2 indent ) Water grate
  286           ... (3 indent ) Downdraft
  287           ... (3 indent ) Intermediate draft
             . (1 indent ) Over firebox
  288           .. (2 indent ) Headers at right angles
             .. (2 indent ) Water grate
  289           ... (3 indent ) Updraft
             . (1 indent ) Rearwardly declined
             .. (2 indent ) Over bridge wall
  290           ... (3 indent ) Front and rear header
  291           .... (4 indent ) Horizontal-longitudinal drum
  292           .... (5 indent ) Firebox tube
  293           .... (5 indent ) Longitudinal water baffle
  294           .... (5 indent ) Water wall
  295           .... (4 indent ) Internal water tube
  296           .... (4 indent ) Longitudinal-declined drum
  297           .... (4 indent ) Transverse drum
             .. (2 indent ) Over firebox
             ... (3 indent ) Front and rear header
  298           .... (4 indent ) Horizontal-longitudinal drum
  299           .... (4 indent ) Transverse drum
  300           .... (4 indent ) Tubes beyond side wall
             .. (2 indent ) Plural upper transverse drum
  301           ... (3 indent ) Plural lower transverse drum
  302           ... (3 indent ) Single lower transverse drum
             . (1 indent ) Rearwardly inclined
             .. (2 indent ) Over firebox
             ... (3 indent ) Front and rear header
  303           .... (4 indent ) Transverse drum
             . (1 indent ) Separate banks
  304           .. (2 indent ) Opposite fireboxes
  305           . (1 indent ) Spur
  306           .. (2 indent ) Bridge wall header
  307           .. (2 indent ) Central standpipe
  308           ... (3 indent ) Fluid fuel
  309           ... (3 indent ) Annular firebox
  310           ... (3 indent ) Central magazine
  311           .. (2 indent ) Cross
  312           .. (2 indent ) Horizontal-longitudinal drum
  313           .. (2 indent ) Over bridge wall
             .. (2 indent ) Over firebox
  314           ... (3 indent ) Central header
  315           ... (3 indent ) Declined
  316           ... (3 indent ) Horizontal
  317           .. (2 indent ) Straddle
  318           .. (2 indent ) Vertical
  319           ... (3 indent ) Fluid fuel
  320           ... (3 indent ) Central magazine
  321           . (1 indent ) Standpipe
  322           .. (2 indent ) Fluid fuel
  323           .. (2 indent ) Annular firebox
  324           . (1 indent ) Straddle
             .. (2 indent ) Plural upper drum
  325           ... (3 indent ) Plural lower drum
  326           .... (4 indent ) Cross
             .. (2 indent ) Single upper drum
  327           ... (3 indent ) Plural lower drum
  328           .... (4 indent ) Fluid fuel
  329           .... (4 indent ) Cross
  330           .... (4 indent ) Plural firebox
  331           . (1 indent ) Transverse horizontal drum
  332           . (1 indent ) Vertical
  333           .. (2 indent ) Fluid fuel
  334           .. (2 indent ) Side magazine
  335           .. (2 indent ) Annular firebox
  336           .. (2 indent ) Offset firebox
  337           ... (3 indent ) Elevated
             .. (2 indent ) Annular lower drum
  338           ... (3 indent ) Annular upper drum
  339           .... (4 indent ) Central magazine
  340           .... (4 indent ) Tubes over firebox
  341           ... (3 indent ) Fire tube upper drum
  342           ... (3 indent ) Spur tube upper drum
  343           ... (3 indent ) Upper drum
  344           .... (4 indent ) Central magazine
  345           .. (2 indent ) Beyond bridge wall
  346           ... (3 indent ) Gas return
             ... (3 indent ) Longitudinal upper drum
  347           .... (4 indent ) Longitudinal lower drum
             .. (2 indent ) Internal fire tube
  348           ... (3 indent ) Fluid fuel
  349           .. (2 indent ) Over firebox
  350           ... (3 indent ) Gas return
             .. (2 indent ) Plural upper longitudinal drum
  351           ... (3 indent ) Plural lower longitudinal drum
             .. (2 indent ) Plural upper transverse drum
             ... (3 indent ) Plural lower transverse drum
  352           .... (4 indent ) Offset firebox
  353           . (1 indent ) Water grate
  354           .. (2 indent ) Downdraft
  355           . (1 indent ) Zigzag
  356           .. (2 indent ) Fluid fuel
             .. (2 indent ) Over bridge wall
  357           ... (3 indent ) Longitudinal drum
  358           ... (3 indent ) Transverse drum
  359           .. (2 indent ) Over firebox
  237           . (1 indent ) Magazine
  236           . (1 indent ) Fluid fuel
             . (1 indent ) Headers
  360           .. (2 indent ) Closures and couplings
  361           ... (3 indent ) Cleaning
  362           ... (3 indent ) Concentric tube
  363           ... (3 indent ) Drum
  364           ... (3 indent ) Tube closures
  365           . (1 indent ) Drums and couplings
  366           WICK
  367.1           HEAT TRANSMITTER
  367.2           . (1 indent ) Double immersed heat transmitters
  367.3           . (1 indent ) Corrugated and finned heat transmitters
  367.4           . (1 indent ) Pebble furnaces
  368           WATER FIREBOX
  369           . (1 indent ) Mud ring
  370           . (1 indent ) Plural
  371           WATER GRATE
             . (1 indent ) Plural firebox
             .. (2 indent ) Superimposed
             ... (3 indent ) Water grate
  372           .... (4 indent ) Updraft
  373           . (1 indent ) Cage
  374           . (1 indent ) Grate structure
  375           .. (2 indent ) Solid and water bar
  376           . (1 indent ) Progressive feed
             . (1 indent ) Water firebox
             .. (2 indent ) Solid and water bar
  377           ... (3 indent ) Updraft
  378           .. (2 indent ) Updraft
  21           CHEMICAL
  22           FLUID AND SOLID FUEL
  23           FLUID FUEL
  24           . (1 indent ) Explosion
             . (1 indent ) Plural burner
  25           .. (2 indent ) Superimposed
  26           FRICTION GENERATOR
             NONCOMBUSTIBLE HEATER
  27           . (1 indent ) Surface
  28           . (1 indent ) Water in contact
  379           CLEANING
  380           . (1 indent ) Agitating circulator
             . (1 indent ) Blow off
  381           .. (2 indent ) Bottom and surface
  382           .. (2 indent ) Bottom
  383           ... (3 indent ) Internal conduit
  384           .... (4 indent ) Ejector
  385           .... (4 indent ) Mud ring
  386           .... (4 indent ) Pan
  387           .... (4 indent ) Scraper
  388           .... (4 indent ) Valved
  389           .. (2 indent ) Surface exit
  390           . (1 indent ) Fluid jet
  391           .. (2 indent ) Horizontal fire tube boiler
  392           .. (2 indent ) Water tube boiler
  393           . (1 indent ) Mud drum
  394           . (1 indent ) Pans
  395           . (1 indent ) Sandblast
  396           . (1 indent ) Systems
  397           . (1 indent ) Trapped circuit
  398           .. (2 indent ) Feeding water
  399           .. (2 indent ) Surface and bottom exit
  400           .. (2 indent ) Surface exit
  401           ... (3 indent ) Chemical feeder
  402           ... (3 indent ) Circulating pump
  403           ... (3 indent ) Feed heater
  404           ... (3 indent ) Steam injector
  405           . (1 indent ) Wash-out nozzle
  406.1           CIRCULATION
  406.2           . (1 indent ) Having anticavitation devices
  406.3           . (1 indent ) Having restrictors and orifices
  406.4           . (1 indent ) Once through
  406.5           . (1 indent ) With start-up operations
  407           . (1 indent ) Injector
  408.1           . (1 indent ) Having internal conduit
  408.2           .. (2 indent ) With internal geyser tube
  409           .. (2 indent ) Horizontal flue boiler
  410           ... (3 indent ) Return fire tube
             . (1 indent ) Mechanical
  411           .. (2 indent ) Internal
  412           FEED HEATERS
  413           . (1 indent ) Ash pan
             . (1 indent ) Boiler circuit
  414           .. (2 indent ) Feed-injected
             . (1 indent ) Circulatioon
             .. (2 indent ) Surface exit
             ... (3 indent ) Mechanical pump
  415           .... (4 indent ) Feed-injected
  417           . (1 indent ) Drip plate in boiler
             . (1 indent ) Fire-engine boiler
             .. (2 indent ) Auxiliary
  418           ... (3 indent ) Attached
  419           ... (3 indent ) Detachable
  420           . (1 indent ) Furnace gases
  421           . (1 indent ) Offtake flue
  422           . (1 indent ) Furnace gases and steam
             . (1 indent ) Horizontal fire tube boiler
  423           .. (2 indent ) Smoke box
  424           ... (3 indent ) Exhaust pipe
  425           ... (3 indent ) Furnace gases and steam
  426           ... (3 indent ) Water tube
  427           .. (2 indent ) Smoke chamber
  428           . (1 indent ) Internal conduit
  429           .. (2 indent ) Automatic sediment valve
  430           .. (2 indent ) Blow-off delivery
  431           .. (2 indent ) Filter in boiler
  432           .. (2 indent ) Furnace gases
  433           .. (2 indent ) Trap outside boiler
  434           . (1 indent ) Locomotive tender
  435           . (1 indent ) Pan in steam space
  436           .. (2 indent ) Spray
  437           . (1 indent ) Safety valve
  438           . (1 indent ) Spray to steam space
  439           . (1 indent ) Stack
  441           . (1 indent ) Steam
  442           .. (2 indent ) Injected
             ... (3 indent ) Superposed
  443           .... (4 indent ) Open to steam space
  444           . (1 indent ) Water tube boiler
             REGULATION
             . (1 indent ) Fuel and water
  446           .. (2 indent ) Fluid fuel
  447           ... (3 indent ) Cutoff
             .. (2 indent ) Automatic control
  449           ... (3 indent ) Solid fuel
  450           . (1 indent ) Suspended boiler
  448.1           AUTOMATIC CONTROL OF FLUID FUEL AND WATER
  448.2           . (1 indent ) Having fuel or feed bypass
  448.3           . (1 indent ) Multiple boiler regulation
  448.4           . (1 indent ) Once through
  451R           FEEDERS
             . (1 indent ) Automatic
  451.1           .. (2 indent ) Thermally controlled
  451.2           ... (3 indent ) Pressure-operated valve
  452           . (1 indent ) Boiler pressure
             . (1 indent ) Gravity
  456           .. (2 indent ) Automatic
  457           ... (3 indent ) Heater
  458           .. (2 indent ) Heater
  451S           . (1 indent ) Once through
  459           STEAM TREATMENT
  460           . (1 indent ) Boilers with superheaters
             . (1 indent ) Fire tube boiler
             .. (2 indent ) Horizontal
  461           ... (3 indent ) Superheater
             .... (4 indent ) In fire tube
  462           .... (5 indent ) From smoke box
             .... (4 indent ) Interior steam space
  463           .... (5 indent ) Internal fire tube
             .... (4 indent ) Smoke box
  464           .... (5 indent ) Fire tube
  465           .... (5 indent ) Steam tube
  466           .. (2 indent ) Superheater and feed heater
             .. (2 indent ) Vertical
  467           ... (3 indent ) Superheater
             . (1 indent ) Flue boiler
             .. (2 indent ) Vertical
             ... (3 indent ) Internal water tube
  468           .... (4 indent ) Superheater
             . (1 indent ) Horizontal boiler
             .. (2 indent ) Superheater
  469           ... (3 indent ) Rear of firebox
  470           ... (3 indent ) Waste-heat flue
             . (1 indent ) Water tube boiler
             .. (2 indent ) Declined over bridge wall
             ... (3 indent ) Front and rear header
             .... (4 indent ) Declined drum
  471           .... (5 indent ) Superheater
             .... (4 indent ) Longitudinal drum
  472           .... (5 indent ) Superheater
             .. (2 indent ) Longitudinal drum
  473           ... (3 indent ) Superheater
             .. (2 indent ) Over bridge wall
  474           ... (3 indent ) Superheater
             .. (2 indent ) Standpipe
             ... (3 indent ) Spur tube
  475           .... (4 indent ) Superheater
             .. (2 indent ) Transverse drum
  478           ... (3 indent ) Superheater
  477           .. (2 indent ) Superheater and feed heater
  476           .. (2 indent ) Superheater
             . (1 indent ) Superheater
  480           .. (2 indent ) Damper-controlled
  481           .. (2 indent ) Firebox
  482           .. (2 indent ) Fire tube in steam space
  483           .. (2 indent ) Indirectly heated
  484           .. (2 indent ) Separate charges
  485           .. (2 indent ) Separate furnace
  486           .. (2 indent ) Steam dome
  487           .. (2 indent ) Water-injected
  479.1           . (1 indent ) Automatic heat regulation of superheater
  479.2           .. (2 indent ) Having gas recirculation
  479.3           .. (2 indent ) Having flame positioning
  479.4           .. (2 indent ) With variable firing
  479.5           .. (2 indent ) Having dampers
  479.6           .. (2 indent ) Plural furnaces
  479.7           .. (2 indent ) Once through
             SEPARATORS
  488           . (1 indent ) Boiler circulation
  489           . (1 indent ) Boiler return
  490           . (1 indent ) For tilting boilers
  491           . (1 indent ) Interior of boilers
  492           . (1 indent ) Steam dome
  493           BRACES AND STAYS
  494           CASINGS
  495           CROWN SHEETS PROTECTING
  496           CROWN SHEETS AND STAYS
  497           FRONTS
  498           . (1 indent ) Doors
  499           . (1 indent ) Mouths
  500           .. (2 indent ) Water firebox
  501           FLUID-DISPLACER
  502           . (1 indent ) Fluid fuel
  503           FUEL BAFFLES
  504           SAFETY DEVICES
  504.1           . (1 indent ) Fusible control
  504.2           . (1 indent ) Alarms or indicators
             . (1 indent ) Fire extinguishers
  504.3           .. (2 indent ) Fusible control
  505           .. (2 indent ) Float-controlled
  506           .. (2 indent ) Pressure-controlled
  507           . (1 indent ) Self-closing valve
  508           STEAM DOMES
  509           SUBMERGED STEAM CHAMBER
  510           SUPPORTS
  511           TUBES AND CONNECTIONS
  512           TUBE SHEETS
 
 FOREIGN ART COLLECTIONS
 
  FOR000           CLASS-RELATED FOREIGN DOCUMENTS
 Any foreign patents or non-patent literature from subclasses that have been reclassified have been transferred directly to FOR Collections listed below. These Collections contain ONLY foreign patents or non-patent literature. The parenthetical references in the Collection titles refer to the abolished subclasses from which these Collections were derived.
 
  FOR100           STAND BOILER (122/13.1)
  FOR101           . (1 indent ) Electric (122/13.2)
             . (1 indent ) Fire tube and water tube (122/unnumbered)
  FOR102           .. (2 indent ) Fluid fuel (122/16)
             . (1 indent ) Fire tube (122/unnumbered)
  FOR103           .. (2 indent ) Fluid fuel (122/17)
             . (1 indent ) Water tube (122/unnumbered)
             .. (2 indent ) Below boiler (122/unumbered)
  FOR104           ... (3 indent ) Fluid fuel (122/18)
             .. (2 indent ) Casing (122/unnumbered)
  FOR105           ... (3 indent ) Fluid fuel (122/19)
  FOR106           . (1 indent ) Fluid fuel (122/14)
  FOR107           . (1 indent ) Solid fuel (122/15)
 
 DIGESTS
 
   DIG1           AIR HEATER
   DIG2           AIR HEATER - INDIRECTLY HEATED
   DIG3           GAS FLOW BAFFLES
   DIG4           ONCE THROUGH BOILERS
   DIG5           CRITICAL PRESSURE
   DIG6           DAMPER-DIRECTED RADIATION
   DIG7           FEEDING AIR
   DIG10           PORTABLE UNITS
   DIG11           REMOVABLE STEAM-HEATING ELEMENTS
   DIG13           TUBES - COMPOSITION AND PROTECTION
   DIG14           TUBE REPLACEMENT
   DIG15           VALVES
   DIG16           WELDING


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