RADAR - Class 342
RADIANT ENERGY - Classes 250, 342, 343
RADIATE - Class 343
RADIATION - Classes 216, 342, 430
RADIATION FIELD - Class 342
RADIO OR HERTZ WAVE - Class 343
RADIOACTIVE - Classes 423, 588
RADIOACTIVE ACTIVE - Class 250
RADIOACTIVE ELEMENT - Class 075
RADIOTELEPHONE SYSTEM - Class 455
RAM - Class 438
RAMMING - Class 164
RANGE - Classes 081, 269
RANGEFINDING - Class 396
RARE EARTH ELEMENT - Class 501
RARE EARTH METAL* - Class 075
RARE EARTH* - Class 420
RARE EARTHS - Classes 257, 423, 588
RATCHET - Class 400
RBS - Class 438
RBT - Class 438
RC OR RL FREQUENCY DETERMINING NETWORK - Class 331
RCT - Class 438
REACTANT - Classes 429, 528
REACTING SURFACE - Class 440
REACTION BY-PRODUCTS - Class 376
REACTION ZONE - Class 060
REACTIVE COUPLING - Class 330
REACTIVE DYE - Class 008
REACTIVITY - Class 376
REACTIVITY AFFECTING MATERIAL - Class 376
REACTOR CORE (FISSION REACTOR) - Class 376
REACTOR GEOMETRY (FISSION REACTOR) - Class 376
READ-IN (n.) - Class 234
READ-OUT (n.) - Class 234
READ-OUT REGISTER - Class 257
REBAR - Class 052
REBEADING - Class 425
RECAPPING - Class 425
RECEIVER - Classes 141, 258, 355, 725
RECEPTACLE - Classes 053, 406, 413
RECEPTOR - Class 435
RECEPTOR ELEMENT - Class 430
RECESSED-ROLL - Class 226
RECIPROCATING MOTION - Class 074
RECIPROCATING OR OSCILLATING MOTOR - Class 318
RECIPROCATING RECTILINEARLY - Class 366
RECOMBINATION - Classes 257, 438
RECORD - Class 369
RECORD CARRIER - Class 369
RECORD-MEDIUM - Class 400
RECOVERED OBJECTS - Class 171
RECOVERY - Classes 423, 710, 712, 713, 714
RECRYSTALLIZATION - Class 148
RECTIFIER - Class 330
RECTILINEAR MOVEMENT OF CLOSURE - Class 049
RED - Class 438
RED OIL - Class 516
REFINING - Class 208
REFLECTION - Classes 356, 359, 372
REFLECTOR - Classes 343, 362, 376
REFLEX KLYSTRON - Class 331
REFORMING - Class 208
REFRACTION - Classes 356, 359, 372
REFRACTOR - Class 362
REFRACTORY - Classes 428, 501
REFRACTORY METAL* - Class 075
REFRACTORY METAL* - Class 420
REFRACTORY METALS - Classes 257, 423
REFUSE - Class 110
REGENERATION - Classes 095, 096
REGISTERING - Class 425
REGULATION - Class 320
Regulator - Class 800
REINFORCEMENT, EMBEDDED - Class 052
RELAXATION OSCILLATOR - Class 331
RELEASER - Class 221
REMOVABLE CLOSURE - Class 049
REMOVE - Class 099
REPAIR - Class 029
REPEATER - Class 725
REPETITIOUS WAVE - Classes 329, 332
REPULSION MOTOR - Class 318
RESERVOIR - Class 401
RESHAPING - Classes 065, 264, 425
RESIDUE - Classes 073, 210
RESILIENT - Class 221
RESILIENT* - Class 024
RESIN CAPTURE - Class 506
RESIN, NATURAL - Class 516
RESIN, SYNTHETIC - Class 516
RESINOID - Class 516
RESISTANCE - Class 338
RESISTANCE ELEMENT - Class 338
RESISTANCE TERMINAL - Class 338
RESISTIVITY - Classes 257, 438
RESISTOR - Class 338
RESIZING - Class 425
RESOLVER - Class 516
RESONANCE - Class 334
RESONANT CAVITY - Class 372
RESONANT CIRCUIT - Class 330
RESONANT TUNNELLING DEVICE - Classes 257, 438
RESONATOR - Classes 330, 333
RESONATOR OR RESONANT CIRCUIT - Class 331
RESOURCE - Classes 709, 718, 719
RESTRICTED SPACE - Class 343
resurf - Class 438
RETAINER - Class 403
RETARDER - Class 431
RETARDING FIELD TUBE - Class 331
RETENTATE - Class 210
RETRACTION - Class 175
RETRIEVAL - Class 369
RETROREFLECTION - Class 359
RETT - Class 438
REVEAL - Class 052
REVERBERATORY FURNACE - Class 075
REVERSE BIAS - Class 257
REVERSE BREAKDOWN VOLTAGE - Class 257
REVERSE CURRENT - Class 257
REVERSE OSMOSIS - Class 210
REVERSING CONTROL - Class 318
RF - Class 438
RHEED - Class 438
RHET - Class 438
RIBBON - Class 400
RIBE - Class 438
RIE - Class 438
RIGID - Class 403
RIGID* - Class 024
RIM - Class 351
RING HETERO ATOM - Class 532
RING NITROGEN - Class 532
RISC - Class 438
RISER - Class 164
RISER: - Class 166
RMS - Class 438
ROCHELLE SALT - Class 117
ROCKING - Class 366
ROD - Classes 029, 428
ROI - Class 438
ROLL - Classes 226, 425
ROLL-COUPLE - Class 226
ROLLER - Classes 072, 228
ROLLER CLUSTER - Class 072
ROLLER COUPLE - Class 072
ROLLER-LIKE MEMBER - Class 228
ROLLER-LIKE TOOL - Class 072
ROM - Class 438
ROOF - Class 373
ROOF (SEE COVER) - Class 052
ROSIN - Classes 428, 516
ROTARY KILN - Class 075
ROTARY MOTION - Class 074
ROTATING - Class 366
ROTOR-TYPE COMBINE - Class 460
ROUTING - Classes 709, 718, 719
ROX - Class 438
RTA - Class 438
RTP - Class 438
RUNNER - Class 415
RUNNING SPEED CONTROL - Class 318