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Current as of: June, 1999
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PLT  HD   PLANTS
2  HD   APPAREL
4  HD   BATHS, CLOSETS, SINKS, AND SPITTOONS
5  HD   BEDS
7  HD   COMPOUND TOOLS
8  HD   BLEACHING AND DYEING; FLUID TREATMENT AND CHEMICAL MODIFICATION OF TEXTILES AND FIBERS
12  HD   BOOT AND SHOE MAKING
14  HD   BRIDGES
15  HD   BRUSHING, SCRUBBING, AND GENERAL CLEANING
16  HD   MISCELLANEOUS HARDWARE
19  HD   TEXTILES: FIBER PREPARATION
23  HD   CHEMISTRY: PHYSICAL PROCESSES
24  HD   BUCKLES, BUTTONS, CLASPS, ETC.
26  HD   TEXTILES: CLOTH FINISHING
27  HD   UNDERTAKING
28  HD   TEXTILES: MANUFACTURING
29  HD   METAL WORKING
30  HD   CUTLERY
33  HD   GEOMETRICAL INSTRUMENTS
34  HD   DRYING AND GAS OR VAPOR CONTACT WITH SOLIDS
36  HD   BOOTS, SHOES, AND LEGGINGS
37  HD   EXCAVATING
38  HD   TEXTILES: IRONING OR SMOOTHING
40  HD   CARD, PICTURE, OR SIGN EXHIBITING
42  HD   FIREARMS
43  HD   FISHING, TRAPPING, AND VERMIN DESTROYING
44  HD   FUEL AND RELATED COMPOSITIONS
47  HD   PLANT HUSBANDRY
48  HD   GAS: HEATING AND ILLUMINATING
49  HD   MOVABLE OR REMOVABLE CLOSURES
51  HD   ABRASIVE TOOL MAKING PROCESS, MATERIAL, OR COMPOSITION
52  HD   STATIC STRUCTURES (E.G., BUILDINGS)
53  HD   PACKAGE MAKING
54  HD   HARNESS
55  HD   GAS SEPARATION
56  HD   HARVESTERS
57  HD   TEXTILES: SPINNING, TWISTING, AND TWINING
59  HD   CHAIN, STAPLE, AND HORSESHOE MAKING
60  HD   POWER PLANTS
62  HD   REFRIGERATION
63  HD   JEWELRY
65  HD   GLASS MANUFACTURING
66  HD   TEXTILES: KNITTING
68  HD   TEXTILES: FLUID TREATING APPARATUS
69  HD   LEATHER MANUFACTURES
70  HD   LOCKS
71  HD   CHEMISTRY: FERTILIZERS
72  HD   METAL DEFORMING
73  HD   MEASURING AND TESTING
74  HD   MACHINE ELEMENT OR MECHANISM
75  HD   SPECIALIZED METALLURGICAL PROCESSES, COMPOSITIONS FOR USE THEREIN, CONSOLIDATED METAL POWDER COMPOSITIONS, AND LOOSE METAL PARTICULATE MIXTURES
76  HD   METAL TOOLS AND IMPLEMENTS, MAKING
79  HD   BUTTON MAKING
81  HD   TOOLS
82  HD   TURNING
83  HD   CUTTING
84  HD   MUSIC
86  HD   AMMUNITION AND EXPLOSIVE-CHARGE MAKING
87  HD   TEXTILES: BRAIDING, NETTING, AND LACE MAKING
89  HD   ORDNANCE
91  HD   MOTORS: EXPANSIBLE CHAMBER TYPE
92  HD   EXPANSIBLE CHAMBER DEVICES
95  HD   GAS SEPARATION: PROCESSES
96  HD   GAS SEPARATION: APPARATUS
99  HD   FOODS AND BEVERAGES: APPARATUS
100  HD   PRESSES
101  HD   PRINTING
102  HD   AMMUNITION AND EXPLOSIVES
104  HD   RAILWAYS
105  HD   RAILWAY ROLLING STOCK
106  HD   COMPOSITIONS: COATING OR PLASTIC
108  HD   HORIZONTALLY SUPPORTED PLANAR SURFACES
109  HD   SAFES, BANK PROTECTION, OR A RELATED DEVICE
110  HD   FURNACES
111  HD   PLANTING
112  HD   SEWING
114  HD   SHIPS
116  HD   SIGNALS AND INDICATORS
117  HD   SINGLE-CRYSTAL, ORIENTED-CRYSTAL, AND EPITAXY GROWTH PROCESSES; NON-COATING APPARATUS THEREFOR
118  HD   COATING APPARATUS
119  HD   ANIMAL HUSBANDRY
122  HD   LIQUID HEATERS AND VAPORIZERS
123  HD   INTERNAL-COMBUSTION ENGINES
124  HD   MECHANICAL GUNS AND PROJECTORS
125  HD   STONE WORKING
126  HD   STOVES AND FURNACES
127  HD   SUGAR, STARCH, AND CARBOHYDRATES
128  HD   SURGERY
131  HD   TOBACCO
132  HD   TOILET
134  HD   CLEANING AND LIQUID CONTACT WITH SOLIDS
135  HD   TENT, CANOPY, UMBRELLA, OR CANE
136  HD   BATTERIES: THERMOELECTRIC AND PHOTOELECTRIC
137  HD   FLUID HANDLING
138  HD   PIPES AND TUBULAR CONDUITS
139  HD   TEXTILES: WEAVING
140  HD   WIREWORKING
141  HD   FLUENT MATERIAL HANDLING, WITH RECEIVER OR RECEIVER COACTING MEANS
142  HD   WOOD TURNING
144  HD   WOODWORKING
147  HD   COOPERING
148  HD   METAL TREATMENT
149  HD   EXPLOSIVE AND THERMIC COMPOSITIONS OR CHARGES
150  HD   PURSES, WALLETS, AND PROTECTIVE COVERS
152  HD   RESILIENT TIRES AND WHEELS
156  HD   ADHESIVE BONDING AND MISCELLANEOUS CHEMICAL MANUFACTURE
157  HD   WHEELWRIGHT MACHINES
159  HD   CONCENTRATING EVAPORATORS
160  HD   FLEXIBLE OR PORTABLE CLOSURE, PARTITION, OR PANEL
162  HD   PAPER MAKING AND FIBER LIBERATION
163  HD   NEEDLE AND PIN MAKING
164  HD   METAL FOUNDING
165  HD   HEAT EXCHANGE
166  HD   WELLS
168  HD   FARRIERY
169  HD   FIRE EXTINGUISHERS
171  HD   UNEARTHING PLANTS OR BURIED OBJECTS
172  HD   EARTH WORKING
173  HD   TOOL DRIVING OR IMPACTING
174  HD   ELECTRICITY: CONDUCTORS AND INSULATORS
175  HD   BORING OR PENETRATING THE EARTH
177  HD   WEIGHING SCALES
178  HD   TELEGRAPHY
180  HD   MOTOR VEHICLES
181  HD   ACOUSTICS
182  HD   FIRE ESCAPE, LADDER, OR SCAFFOLD
184  HD   LUBRICATION
185  HD   MOTORS: SPRING, WEIGHT, OR ANIMAL POWERED
186  HD   MERCHANDISING
187  HD   ELEVATOR, INDUSTRIAL LIFT TRUCK, OR STATIONARY LIFT FOR VEHICLE
188  HD   BRAKES
190  HD   TRUNKS AND HAND-CARRIED LUGGAGE
191  HD   ELECTRICITY: TRANSMISSION TO VEHICLES
192  HD   CLUTCHES AND POWER-STOP CONTROL
193  HD   CONVEYORS, CHUTES, SKIDS, GUIDES, AND WAYS
194  HD   CHECK-ACTUATED CONTROL MECHANISMS
196  HD   MINERAL OILS: APPARATUS
198  HD   CONVEYORS: POWER-DRIVEN
199  HD   TYPE CASTING
200  HD   ELECTRICITY: CIRCUIT MAKERS AND BREAKERS
201  HD   DISTILLATION: PROCESSES, THERMOLYTIC
202  HD   DISTILLATION: APPARATUS
203  HD   DISTILLATION: PROCESSES, SEPARATORY
204  HD   CHEMISTRY: ELECTRICAL AND WAVE ENERGY
205  HD   ELECTROLYSIS: PROCESSES, COMPOSITIONS USED THEREIN, AND METHODS OF PREPARING THE COMPOSITIONS
206  HD   SPECIAL RECEPTACLE OR PACKAGE
208  HD   MINERAL OILS: PROCESSES AND PRODUCTS
209  HD   CLASSIFYING, SEPARATING, AND ASSORTING SOLIDS
210  HD   LIQUID PURIFICATION OR SEPARATION
211  HD   SUPPORTS: RACKS
212  HD   TRAVERSING HOISTS
213  HD   RAILWAY DRAFT APPLIANCES
215  HD   BOTTLES AND JARS
216  HD   ETCHING A SUBSTRATE: PROCESSES
217  HD   WOODEN RECEPTACLES
218  HD   HIGH-VOLTAGE SWITCHES WITH ARC PREVENTING OR EXTINGUISHING DEVICES
219  HD   ELECTRIC HEATING
220  HD   RECEPTACLES
221  HD   ARTICLE DISPENSING
222  HD   DISPENSING
223  HD   APPAREL APPARATUS
224  HD   PACKAGE AND ARTICLE CARRIERS
225  HD   SEVERING BY TEARING OR BREAKING
226  HD   ADVANCING MATERIAL OF INDETERMINATE LENGTH
227  HD   ELONGATED-MEMBER-DRIVING APPARATUS
228  HD   METAL FUSION BONDING
229  HD   ENVELOPES, WRAPPERS, AND PAPERBOARD BOXES
231  HD   WHIPS AND WHIP APPARATUS
232  HD   DEPOSIT AND COLLECTION RECEPTACLES
234  HD   SELECTIVE CUTTING (E.G., PUNCHING)
235  HD   REGISTERS
236  HD   AUTOMATIC TEMPERATURE AND HUMIDITY REGULATION
237  HD   HEATING SYSTEMS
238  HD   RAILWAYS: SURFACE TRACK
239  HD   FLUID SPRINKLING, SPRAYING, AND DIFFUSING
241  HD   SOLID MATERIAL COMMINUTION OR DISINTEGRATION
242  HD   WINDING, TENSIONING, OR GUIDING
244  HD   AERONAUTICS
245  HD   WIRE FABRICS AND STRUCTURE
246  HD   RAILWAY SWITCHES AND SIGNALS
248  HD   SUPPORTS
249  HD   STATIC MOLDS
250  HD   RADIANT ENERGY
251  HD   VALVES AND VALVE ACTUATION
252  HD   COMPOSITIONS
254  HD   IMPLEMENTS OR APPARATUS FOR APPLYING PUSHING OR PULLING FORCE
256  HD   FENCES
257  HD   ACTIVE SOLID-STATE DEVICES (E.G., TRANSISTORS, SOLID-STATE DIODES)
258  HD   RAILWAY MAIL DELIVERY
260  HD   CHEMISTRY OF CARBON COMPOUNDS
261  HD   GAS AND LIQUID CONTACT APPARATUS
264  HD   PLASTIC AND NONMETALLIC ARTICLE SHAPING OR TREATING: PROCESSES
266  HD   METALLURGICAL APPARATUS
267  HD   SPRING DEVICES
269  HD   WORK HOLDERS
270  HD   SHEET-MATERIAL ASSOCIATING
271  HD   SHEET FEEDING OR DELIVERING
273  HD   AMUSEMENT DEVICES: GAMES
276  HD   TYPESETTING
277  HD   SEAL FOR A JOINT OR JUNCTURE
278  HD   LAND VEHICLES: ANIMAL DRAFT APPLIANCES
279  HD   CHUCKS OR SOCKETS
280  HD   LAND VEHICLES
281  HD   BOOKS, STRIPS, AND LEAVES
283  HD   PRINTED MATTER
285  HD   PIPE JOINTS OR COUPLINGS
289  HD   KNOTS AND KNOT TYING
290  HD   PRIME-MOVER DYNAMO PLANTS
291  HD   TRACK SANDERS
292  HD   CLOSURE FASTENERS
293  HD   VEHICLE FENDERS
294  HD   HANDLING: HAND AND HOIST-LINE IMPLEMENTS
295  HD   RAILWAY WHEELS AND AXLES
296  HD   LAND VEHICLES: BODIES AND TOPS
297  HD   CHAIRS AND SEATS
298  HD   LAND VEHICLES: DUMPING
299  HD   MINING OR IN SITU DISINTEGRATION OF HARD MATERIAL
300  HD   BRUSH, BROOM, AND MOP MAKING
301  HD   LAND VEHICLES: WHEELS AND AXLES
303  HD   FLUID-PRESSURE AND ANALOGOUS BRAKE SYSTEMS
305  HD   WHEEL SUBSTITUTES FOR LAND VEHICLES
307  HD   ELECTRICAL TRANSMISSION OR INTERCONNECTION SYSTEMS
310  HD   ELECTRICAL GENERATOR OR MOTOR STRUCTURE
312  HD   SUPPORTS: CABINET STRUCTURE
313  HD   ELECTRIC LAMP AND DISCHARGE DEVICES
314  HD   ELECTRIC LAMP AND DISCHARGE DEVICES: CONSUMABLE ELECTRODES
315  HD   ELECTRIC LAMP AND DISCHARGE DEVICES: SYSTEMS
318  HD   ELECTRICITY: MOTIVE POWER SYSTEMS
320  HD   ELECTRICITY: BATTERY OR CAPACITOR CHARGING OR DISCHARGING
322  HD   ELECTRICITY: SINGLE GENERATOR SYSTEMS
323  HD   ELECTRICITY: POWER SUPPLY OR REGULATION SYSTEMS
324  HD   ELECTRICITY: MEASURING AND TESTING
326  HD   ELECTRONIC DIGITAL LOGIC CIRCUITRY
327  HD   MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS
329  HD   DEMODULATORS
330  HD   AMPLIFIERS
331  HD   OSCILLATORS
332  HD   MODULATORS
333  HD   WAVE TRANSMISSION LINES AND NETWORKS
334  HD   TUNERS
335  HD   ELECTRICITY: MAGNETICALLY OPERATED SWITCHES, MAGNETS, AND ELECTROMAGNETS
336  HD   INDUCTOR DEVICES
337  HD   ELECTRICITY: ELECTROTHERMALLY OR THERMALLY ACTUATED SWITCHES
338  HD   ELECTRICAL RESISTORS
340  HD   COMMUNICATIONS: ELECTRICAL
341  HD   CODED DATA GENERATION OR CONVERSION
342  HD   COMMUNICATIONS: DIRECTIVE RADIO WAVE SYSTEMS AND DEVICES (E.G., RADAR, RADIO NAVIGATION)
343  HD   COMMUNICATIONS: RADIO WAVE ANTENNAS
345  HD   COMPUTER GRAPHICS PROCESSING, OPERATOR INTERFACE PROCESSING, AND SELECTIVE VISUAL DISPLAY SYSTEMS
346  HD   RECORDERS
347  HD   INCREMENTAL PRINTING OF SYMBOLIC INFORMATION
348  HD   TELEVISION
349  HD   LIQUID CRYSTAL CELLS, ELEMENTS AND SYSTEMS
351  HD   OPTICS: EYE EXAMINING, VISION TESTING AND CORRECTING
352  HD   OPTICS: MOTION PICTURES
353  HD   OPTICS: IMAGE PROJECTORS
355  HD   PHOTOCOPYING
356  HD   OPTICS: MEASURING AND TESTING
358  HD   FACSIMILE AND STATIC PRESENTATION PROCESSING
359  HD   OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS
360  HD   DYNAMIC MAGNETIC INFORMATION STORAGE OR RETRIEVAL
361  HD   ELECTRICITY: ELECTRICAL SYSTEMS AND DEVICES
362  HD   ILLUMINATION
363  HD   ELECTRIC POWER CONVERSION SYSTEMS
365  HD   STATIC INFORMATION STORAGE AND RETRIEVAL
366  HD   AGITATING
367  HD   COMMUNICATIONS, ELECTRICAL: ACOUSTIC WAVE SYSTEMS AND DEVICES
368  HD   HOROLOGY: TIME MEASURING SYSTEMS OR DEVICES
369  HD   DYNAMIC INFORMATION STORAGE OR RETRIEVAL
370  HD   MULTIPLEX COMMUNICATIONS
372  HD   COHERENT LIGHT GENERATORS
373  HD   INDUSTRIAL ELECTRIC HEATING FURNACES
374  HD   THERMAL MEASURING AND TESTING
375  HD   PULSE OR DIGITAL COMMUNICATIONS
376  HD   INDUCED NUCLEAR REACTIONS: PROCESSES, SYSTEMS, AND ELEMENTS
377  HD   ELECTRICAL PULSE COUNTERS, PULSE DIVIDERS, OR SHIFT REGISTERS: CIRCUITS AND SYSTEMS
378  HD   X-RAY OR GAMMA RAY SYSTEMS OR DEVICES
379  HD   TELEPHONIC COMMUNICATIONS
380  HD   CRYPTOGRAPHY
381  HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES
382  HD   IMAGE ANALYSIS
383  HD   FLEXIBLE BAGS
384  HD   BEARINGS
385  HD   OPTICAL WAVEGUIDES
386  HD   TELEVISION SIGNAL PROCESSING FOR DYNAMIC RECORDING OR REPRODUCING
388  HD   ELECTRICITY: MOTOR CONTROL SYSTEMS
392  HD   ELECTRIC RESISTANCE HEATING DEVICES
395  HD   INFORMATION PROCESSING SYSTEM ORGANIZATION
396  HD   PHOTOGRAPHY
399  HD   ELECTROPHOTOGRAPHY
400  HD   TYPEWRITING MACHINES
401  HD   COATING IMPLEMENTS WITH MATERIAL SUPPLY
402  HD   BINDER DEVICE RELEASABLY ENGAGING APERTURE OR NOTCH OF SHEET
403  HD   JOINTS AND CONNECTIONS
404  HD   ROAD STRUCTURE, PROCESS, OR APPARATUS
405  HD   HYDRAULIC AND EARTH ENGINEERING
406  HD   CONVEYORS: FLUID CURRENT
407  HD   CUTTERS, FOR SHAPING
408  HD   CUTTING BY USE OF ROTATING AXIALLY MOVING TOOL
409  HD   GEAR CUTTING, MILLING, OR PLANING
410  HD   FREIGHT ACCOMMODATION ON FREIGHT CARRIER
411  HD   EXPANDED, THREADED, DRIVEN, HEADED, TOOL-DEFORMED, OR LOCKED-THREADED FASTENER
412  HD   BOOKBINDING: PROCESS AND APPARATUS
413  HD   SHEET METAL CONTAINER MAKING
414  HD   MATERIAL OR ARTICLE HANDLING
415  HD   ROTARY KINETIC FLUID MOTORS OR PUMPS
416  HD   FLUID REACTION SURFACES (I.E., IMPELLERS)
417  HD   PUMPS
418  HD   ROTARY EXPANSIBLE CHAMBER DEVICES
419  HD   POWDER METALLURGY PROCESSES
420  HD   ALLOYS OR METALLIC COMPOSITIONS
422  HD   CHEMICAL APPARATUS AND PROCESS DISINFECTING, DEODORIZING, PRESERVING, OR STERILIZING
423  HD   CHEMISTRY OF INORGANIC COMPOUNDS
424  HD   DRUG, BIO-AFFECTING AND BODY TREATING COMPOSITIONS
425  HD   PLASTIC ARTICLE OR EARTHENWARE SHAPING OR TREATING: APPARATUS
426  HD   FOOD OR EDIBLE MATERIAL: PROCESSES, COMPOSITIONS, AND PRODUCTS
427  HD   COATING PROCESSES
428  HD   STOCK MATERIAL OR MISCELLANEOUS ARTICLES
429  HD   CHEMISTRY: ELECTRICAL CURRENT PRODUCING APPARATUS, PRODUCT, AND PROCESS
430  HD   RADIATION IMAGERY CHEMISTRY: PROCESS, COMPOSITION, OR PRODUCT THEREOF
431  HD   COMBUSTION
432  HD   HEATING
433  HD   DENTISTRY
434  HD   EDUCATION AND DEMONSTRATION
435  HD   CHEMISTRY: MOLECULAR BIOLOGY AND MICROBIOLOGY
436  HD   CHEMISTRY: ANALYTICAL AND IMMUNOLOGICAL TESTING
438  HD   SEMICONDUCTOR DEVICE MANUFACTURING: PROCESS
439  HD   ELECTRICAL CONNECTORS
440  HD   MARINE PROPULSION
441  HD   BUOYS, RAFTS, AND AQUATIC DEVICES
442  HD   FABRIC (WOVEN, KNITTED, OR NONWOVEN TEXTILE OR CLOTH, ETC.)
445  HD   ELECTRIC LAMP OR SPACE DISCHARGE COMPONENT OR DEVICE MANUFACTURING
446  HD   AMUSEMENT DEVICES: TOYS
449  HD   BEE CULTURE
450  HD   FOUNDATION GARMENTS
451  HD   ABRADING
452  HD   BUTCHERING
453  HD   COIN HANDLING
454  HD   VENTILATION
455  HD   TELECOMMUNICATIONS
460  HD   CROP THRESHING OR SEPARATING
462  HD   BOOKS, STRIPS, AND LEAVES FOR MANIFOLDING
463  HD   AMUSEMENT DEVICES: GAMES
464  HD   ROTARY SHAFTS, GUDGEONS, HOUSINGS, AND FLEXIBLE COUPLINGS FOR ROTARY SHAFTS
470  HD   THREADED, HEADED FASTENER, OR WASHER MAKING: PROCESS AND APPARATUS
472  HD   AMUSEMENT DEVICES
473  HD   GAMES USING TANGIBLE PROJECTILE
474  HD   ENDLESS BELT POWER TRANSMISSION SYSTEMS OR COMPONENTS
475  HD   PLANETARY GEAR TRANSMISSION SYSTEMS OR COMPONENTS
476  HD   FRICTION GEAR TRANSMISSION SYSTEMS OR COMPONENTS
477  HD   INTERRELATED POWER DELIVERY CONTROLS, INCLUDING ENGINE CONTROL
482  HD   EXERCISE DEVICES
483  HD   TOOL CHANGING
492  HD   ROLL OR ROLLER
493  HD   MANUFACTURING CONTAINER OR TUBE FROM PAPER; OR OTHER MANUFACTURING FROM A SHEET OR WEB
494  HD   IMPERFORATE BOWL: CENTRIFUGAL SEPARATORS
501  HD   COMPOSITIONS: CERAMIC
502  HD   CATALYST, SOLID SORBENT, OR SUPPORT THEREFOR: PRODUCT OR PROCESS OF MAKING
503  HD   RECORD RECEIVER HAVING PLURAL INTERACTIVE LEAVES OR A COLORLESS COLOR FORMER, METHOD OF USE, OR DEVELOPER THEREFOR
504  HD   PLANT PROTECTING AND REGULATING COMPOSITIONS
505  HD   SUPERCONDUCTOR TECHNOLOGY: APPARATUS, MATERIAL, PROCESS
507  HD   EARTH BORING, WELL TREATING, AND OIL FIELD CHEMISTRY
508  HD   SOLID ANTI-FRICTION DEVICES, MATERIALS THEREFOR, LUBRICANT OR SEPARATE COMPOSITIONS FOR MOVING SOLID SURFACES, AND MISCELLANEOUS MINERAL OIL COMPOSITIONS
510  HD   CLEANING COMPOSITIONS FOR SOLID SURFACES, AUXILIARY COMPOSITIONS THEREFOR, OR PROCESSES OF PREPARING THE COMPOSITIONS
512  HD   PERFUME COMPOSITIONS
514  HD   DRUG, BIO-AFFECTING AND BODY TREATING COMPOSITIONS
516  HD   COLLOID SYSTEMS AND WETTING AGENTS; SUBCOMBINATIONS THEREOF; PROCESSES OF
518  HD   CHEMISTRY: FISCHER-TROPSCH PROCESSES; OR PURIFICATION OR RECOVERY OF PRODUCTS THEREOF
520  HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES
521  HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES
522  HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES
523  HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES
524  HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES
525  HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES
526  HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES
527  HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES
528  HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES
530  HD   CHEMISTRY: NATURAL RESINS OR DERIVATIVES; PEPTIDES OR PROTEINS; LIGNINS OR REACTION PRODUCTS THEREOF
532  HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES
534  HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES
536  HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES
540  HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES
544  HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES
546  HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES
548  HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES
549  HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES
552  HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES
554  HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES
556  HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES
558  HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES
560  HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES
562  HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES
564  HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES
568  HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES
570  HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES
585  HD   CHEMISTRY OF HYDROCARBON COMPOUNDS
588  HD   HAZARDOUS OR TOXIC WASTE DESTRUCTION OR CONTAINMENT
600  HD   SURGERY
601  HD   SURGERY: KINESITHERAPY
602  HD   SURGERY: SPLINT, BRACE, OR BANDAGE
604  HD   SURGERY
606  HD   SURGERY
607  HD   SURGERY: LIGHT, THERMAL, AND ELECTRICAL APPLICATION
623  HD   PROSTHESIS (I.E., ARTIFICIAL BODY MEMBERS), PARTS THEREOF, OR AIDS AND ACCESSORIES THEREFOR
700  HD   DATA PROCESSING: GENERIC CONTROL SYSTEMS OR SPECIFIC APPLICATIONS
701  HD   DATA PROCESSING: VEHICLES, NAVIGATION, AND RELATIVE LOCATION
702  HD   DATA PROCESSING: MEASURING, CALIBRATING, OR TESTING
704  HD   DATA PROCESSING: SPEECH SIGNAL PROCESSING, LINGUISTICS, LANGUAGE TRANSLATION, AND AUDIO COMPRESSION/DECOMPRESSION
705  HD   DATA PROCESSING: FINANCIAL, BUSINESS PRACTICE, MANAGEMENT, OR COST/PRICE DETERMINATION
706  HD   DATA PROCESSING: ARTIFICIAL INTELLIGENCE
707  HD  DATA PROCESSING: DATABASE AND FILE MANAGEMENT, DATA STRUCTURES, OR DOCUMENT PROCESSING
708  HD   ELECTRICAL COMPUTERS: ARITHMETIC PROCESSING AND CALCULATING
709  HD   ELECTRICAL COMPUTERS AND DIGITAL PROCESSING SYSTEMS: MULTIPLE COMPUTER OR PROCESS COORDINATING
710  HD   ELECTRICAL COMPUTERS AND DIGITAL DATA PROCESSING SYSTEMS: INPUT/OUTPUT
711  HD   ELECTRICAL COMPUTERS AND DIGITAL PROCESSING SYSTEMS: MEMORY
712  HD   ELECTRICAL COMPUTERS AND DIGITAL PROCESSING SYSTEMS: PROCESSING ARCHITECTURES AND INSTURCTION PROCESSING (E.G., PROCESSORS)
713  HD   ELECTRICAL COMPUTERS AND DIGITAL PROCESSING SYSTEMS: SUPPORT
714  HD   ERROR DETECTION/CORRECTION AND FAULT DETECTION/RECOVERY
800  HD   MULTICELLULAR LIVING ORGANISMS AND UNMODIFIED PARTS THEREOF AND RELATED PROCESSES
901  HD   ROBOTS
902  HD   ELECTRONIC FUNDS TRANSFER
930  HD   PEPTIDE OR PROTEIN SEQUENCE
968  HD   HOROLOGY
976  HD   NUCLEAR TECHNOLOGY
984  HD   MUSICAL INSTRUMENTS
987  HD   ORGANIC COMPOUNDS CONTAINING A Bi, Sb, As, OR P ATOM OR CONTAINING A METAL ATOM OF THE 6TH TO 8TH GROUP OF THE PERIODIC SYSTEM
D01  HD   EDIBLE PRODUCTS
D02  HD   APPAREL AND HABERDASHERY
D03  HD   TRAVEL GOODS AND PERSONAL BELONGINGS
D04  HD   BRUSHWARE
D05  HD   TEXTILE OR PAPER YARD GOODS; SHEET MATERIAL
D06  HD   FURNISHINGS
D07  HD   EQUIPMENT FOR PREPARING OR SERVING FOOD OR DRINK NOT ELSEWHERE SPECIFIED
D08  HD   TOOLS AND HARDWARE
D09  HD   PACKAGES AND CONTAINERS FOR GOODS
D10  HD   MEASURING, TESTING, OR SIGNALLING INSTRUMENTS (1) (2)
D11  HD   JEWELRY, SYMBOLIC INSIGNIA, AND ORNAMENTS
D12  HD   TRANSPORTATION
D13  HD   EQUIPMENT FOR PRODUCTION, DISTRIBUTION, OR TRANSFORMATION OF ENERGY
D14  HD   RECORDING, COMMUNICATION, OR INFORMATION RETRIEVAL EQUIPMENT
D15  HD   MACHINES NOT ELSEWHERE SPECIFIED
D16  HD   PHOTOGRAPHY AND OPTICAL EQUIPMENT
D17  HD   MUSICAL INSTRUMENTS
D18  HD   PRINTING AND OFFICE MACHINERY
D19  HD   OFFICE SUPPLIES; ARTISTS' AND TEACHERS' MATERIALS
D20  HD   SALES AND ADVERTISING EQUIPMENT
D21  HD   GAMES, TOYS, AND SPORTS GOODS
D22  HD   ARMS, PYROTECHNCIS, HUNTING AND FISHING EQUIPMENT
D23  HD   ENVIRONMENTAL HEATING AND COOLING; FLUID HANDLING AND SANITARY EQUIPMENT
D24  HD   MEDICAL AND LABORATORY EQUIPMENT
D25  HD   BUILDING UNITS AND CONSTRUCTION ELEMENTS
D26  HD   LIGHTING
D27  HD   TOBACCO AND SMOKERS' SUPPLIES
D28  HD   COSMETIC PRODUCTS AND TOILET ARTICLES
D29  HD   EQUIPMENT FOR SAFETY, PROTECTION, AND RESCUE (1)
D30  HD   ANIMAL HUSBANDRY
D32  HD   WASHING, CLEANING, OR DRYING MACHINE
D34  HD   MATERIAL OR ARTICLE HANDLING EQUIPMENT
D99  HD   MISCELLANEOUS