Library of Congress Classification Outline – Class T





Subclass T


T1-995                                   Technology (General)

T10.5-11.9                                   Communication of technical information

T11.95-12.5                                 Industrial directories

T55-55.3                                            Industrial safety.  Industrial accident prevention

T55.4-60.8                                   Industrial engineering.  Management engineering

T57-57.97                                          Applied mathematics.  Quantitative methods

T57.6-57.97                                             Operations research.  Systems analysis

T58.4                                                 Managerial control systems

T58.5-58.64                                       Information technology

T58.6-58.62                                       Management information systems

T58.7-58.8                                         Production capacity.  Manufacturing capacity

T59-59.2                                            Standardization

T59.5                                                 Automation

T59.7-59.77                                       Human engineering in industry.  Man-machine systems

T60-60.8                                            Work measurement.  Methods engineering

T61-173                                       Technical education.  Technical schools

T173.2-174.5                               Technological change

T175-178                                     Industrial research.  Research and development

T201-342                                     Patents.  Trademarks

T351-385                                     Mechanical drawing.  Engineering graphics

T391-995                                     Exhibitions.  Trade shows.  World’s fairs


Subclass TA


TA1-2040                               Engineering (General).  Civil engineering (General)

TA164                                          Bioengineering

TA165                                          Engineering instruments, meters, etc.  Industrial instrumentation

TA166-167                                   Human engineering

TA168                                          Systems engineering

TA170-171                                   Environmental engineering

TA174                                          Engineering design

TA177.4-185                                Engineering economy

TA190-194                                   Management of engineering works

TA197-198                                   Engineering meteorology

TA213-215                                   Engineering machinery, tools, and implements

TA329-348                                   Engineering mathematics.  Engineering analysis

TA349-359                                   Mechanics of engineering.  Applied mechanics

TA365-367                                   Acoustics in engineering.  Acoustical engineering

TA401-492                                   Materials of engineering and construction.  Mechanics of materials

TA495                                          Disasters and engineering

TA501-625                                   Surveying

TA630-695                                   Structural engineering (General)

TA703-712                                   Engineering geology.  Rock mechanics.  Soil mechanics.

Underground construction


TA715-787                                   Earthwork.  Foundations

TA800-820                                   Tunneling.  Tunnels

TA1001-1280                                Transportation engineering

TA1501-1820                                Applied optics.  Photonics

TA2001-2040                                Plasma engineering.  Applied plasma dynamics


Subclass TC


TC1-978                                 Hydraulic engineering

TC160-181                                   Technical hydraulics

TC183-201                                   General preliminary operations.  Dredging.  Submarine building

TC203-380                                   Harbors and coast protective works.  Coastal engineering.


TC401-506                                   River, lake, and water-supply engineering (General)

TC530-537                                   River protective works.  Regulation.  Flood control

TC540-558                                   Dams.  Barrages

TC601-791                                   Canals and inland navigation.  Waterways

TC801-978                                   Irrigation engineering.  Reclamation of wasteland.  Drainage

TC1501-1800                          Ocean engineering


Subclass TD


TD1-1066                               Environmental technology.  Sanitary engineering

TD159-168                                   Municipal engineering

TD169-171.8                                Environmental protection

TD172-193.5                                Environmental pollution

TD194-195                                   Environmental effects of industries and plants

TD201-500                                   Water supply for domestic and industrial purposes

TD419-428                                         Water pollution

TD429.5-480.7                                  Water purification.  Water treatment and conditioning.  Saline

water conversion

TD481-493                                         Water distribution systems

TD511-780                                   Sewage collection and disposal systems.  Sewerage

TD783-812.5                                Municipal refuse.  Solid wastes

TD813-870                                   Street cleaning.  Litter and its removal

TD878-894                                   Special types of environment

Including soil pollution, air pollution, noise pollution

TD895-899                                   Industrial and factory sanitation

TD896-899                                         Industrial and factory wastes

TD920-934                                   Rural and farm sanitary engineering

TD940-949                                   Low temperature sanitary engineering

TD1020-1066                                Hazardous substances and their disposal


Subclass TE


TE1-450                                 Highway engineering.  Roads and pavements

TE175-176.5                                 Highway design.  Interchanges and intersections

TE177-178.8                                 Roadside development.  Landscaping

TE200-205                                    Materials for roadmaking

TE206-209.5                                 Location engineering


TE210-228.3                                 Construction details

Including foundations, maintenance, equipment

TE250-278.8                                 Pavements and paved roads

TE279                                          Streets

TE279.5-298                                 Pedestrian facilities

TE280-295                                          Sidewalks.  Footpaths.  Flagging

TE298                                                Curbs.  Curbstones


Subclass TF


TF1-1620                               Railroad engineering and operation

TF200-320                                    Railway construction

TF340-499                                    Railway equipment and supplies

TF501-668                                    Railway operation and management

TF670-851                                    Local and light railways

TF840-851                                          Elevated railways and subways

TF855-1127                                  Electric railways

TF1300-1620                                High speed ground transporation


Subclass TG


TG1-470                                 Bridge engineering


Subclass TH


TH1-9745                               Building construction

TH845-895                                   Architectural engineering.  Structural engineering of buildings

TH900-915                                   Construction equipment in building

TH1000-1725                                Systems of building construction

Including fireproof construction, concrete construction

TH2025-3000                                Details in building design and construction

Including walls, roofs

TH3301-3411                                Maintenance and repair

TH4021-4977                                Buildings: Construction with reference to use

Including public buildings, dwellings

TH5011-5701                                Construction by phase of the work (Building trades)

TH6014-6081                                Environmental engineering of buildings.  Sanitary engineering of


TH6101-6887                                Plumbing and pipefitting

TH7005-7699                                Heating and ventilation.  Air conditioning

TH7700-7975                                Illumination.  Lighting

TH8001-8581                                Decoration and decorative furnishings

TH9025-9745                                Protection of buildings

Including protection from dampness, fire, burglary


Subclass TJ


TJ1-1570                                Mechanical engineering and machinery

TJ163.13-163.25                          Power resources

TJ163.26-163.5                            Energy conservation


TJ170-179                                    Mechanics applied to machinery.  Dynamics

TJ181-210                                    Mechanical movements

TJ210.2-211.47                            Mechanical devices and figures.  Automata.  Ingenious mechanisms.

Robots (General)

TJ212-225                                    Control engineering systems.  Automatic machinery (General)

TJ227-240                                    Machine design and drawing

TJ241-254.7                                 Machine construction (General)

TJ255-265                                    Heat engines

TJ266-267.5                                 Turbines.  Turbomachines (General)

TJ268-740                                    Steam engineering

TJ603-695                                          Locomotives

TJ751-805                                    Miscellaneous motors and engines

Including gas, gasoline, diesel engines

TJ807-830                                    Renewable energy sources

TJ836-927                                    Hydraulic machinery

TJ940-940.5                                 Vacuum technology

TJ950-1030                                  Pneumatic machinery

TJ1040-1119                                Machinery exclusive of prime movers

TJ1125-1345                                Machine shops and machine shop practice

TJ1350-1418                                Hoisting and conveying machinery

TJ1425-1475                                Lifting and pressing machinery

TJ1480-1496                                Agricultural machinery.  Farm machinery

TJ1501-1519                                Sewing machines


Subclass TK


TK1-9971                               Electrical engineering.  Electronics.  Nuclear engineering

TK301-399                                   Electric meters

TK452-454.4                                Electric apparatus and materials.  Electric circuits.  Electric


TK1001-1841                                Production of electric energy or power.  Powerplants.  Central


TK2000-2891                                Dynamoelectric machinery and auxiliaries

Including generators, motors, transformers

TK2896-2985                                Production of electricity by direct energy conversion

TK3001-3521                                Distribution or transmission of electric power

TK4001-4102                                Applications of electric power

TK4125-4399                                Electric lighting

TK4601-4661                                Electric heating

TK5101-6720                                Telecommunication

Including telegraphy, telephone, radio, radar, television

TK7800-8360                                Electronics

TK7885-7895                                      Computer engineering.  Computer hardware

TK8300-8360                                      Photoelectronic devices (General)

TK9001-9401                                Nuclear engineering.  Atomic power

TK9900-9971                                Electricity for amateurs.  Amateur constructors’ manuals


Subclass TL


TL1-4050                               Motor vehicles.  Aeronautics.  Astronautics

TL1-484                                       Motor vehicles.  Cycles


TL500-777                                    Aeronautics.  Aeronautical engineering

TL780-785.8                                 Rocket propulsion.  Rockets

TL787-4050                                  Astronautics.  Space travel


Subclass TN


TN1-997                                 Mining engineering.  Metallurgy

TN263-271                                   Mineral deposits.  Metallic ore deposits.  Prospecting

TN275-325                                   Practical mining operations.  Safety measures

TN331-347                                   Mine transportation, haulage and hoisting.  Mining machinery

TN400-580                                   Ore deposits and mining of particular metals

TN600-799                                   Metallurgy

TN799.5-948                                Nonmetallic minerals

TN950-997                                   Building and ornamental stones


Subclass TP


TP1-1185                               Chemical technology

TP155-156                                    Chemical engineering

TP200-248                                    Chemicals: Manufacture, use, etc.

TP248.13-248.65                          Biotechnology

TP250-261                                    Industrial electrochemistry

TP267.5-301                                 Explosives and pyrotechnics

TP315-360                                    Fuel

TP368-456                                    Food processing and manufacture

TP480-498                                    Low temperature engineering.  Cryogenic engineering.  Refrigeration

TP500-660                                    Fermentation industries.  Beverages.  Alcohol

TP670-699                                    Oils, fats, and waxes

TP690-692.5                                       Petroleum refining.  Petroleum products

TP700-746                                    Illuminating industries (Nonelectric)

TP751-762                                    Gas industry

TP785-869                                    Clay industries.  Ceramics.  Glass

TP875-888                                    Cement industries

TP890-933                                    Textile bleaching, dyeing, printing, etc.

TP934-945                                    Paints, pigments, varnishes, etc.

TP1080-1185                                Polymers and polymer manufacture


Subclass TR


TR1-1050                               Photography

TR250-265                                   Cameras

TR287-500                                   Photographic processing.  Darkroom technique

TR504-508                                   Transparencies.  Diapositives

TR510-545                                   Color photography

TR550-581                                   Studio and laboratory

TR590-620                                   Lighting

TR624-835                                   Applied photography

Including artistic, commercial, medical photography,

photocopying processes

TR845-899                                   Cinematography.  Motion pictures


TR925-1050                                  Photomechanical processes


Subclass TS


TS1-2301                                Manufactures

TS155-194                                    Production management.  Operations management

TS195-198.8                                 Packaging

TS200-770                                    Metal manufactures.  Metalworking

TS780-788                                    Stonework

TS800-937                                    Wood technology.  Lumber

TS840-915                                          Wood products.  Furniture

TS920-937                                          Chemical processing of wood

TS940-1047                                  Leather industries.  Tanning

TS1060-1070                                Furs

TS1080-1268                                Paper manufacture and trade

TS1300-1865                                Textile industries

TS1870-1935                                Rubber industry

TS1950-1982                                Animal products

TS2120-2159                                Cereals and grain.  Milling industry

TS2220-2283                                Tobacco industry

TS2284-2288                                Animal feeds and feed mills.  Pet food industry


Subclass TT


TT1-999                                 Handicrafts.  Arts and crafts

TT161-170.7                                Manual training.  School shops

TT174-176                                   Articles for children

TT180-200                                   Woodworking.  Furniture making.  Upholstering

TT201-203                                   Lathework.  Turning

TT205-267                                   Metalworking

TT300-382.8                                Painting.  Wood finishing

TT387-410                                   Soft home furnishings

TT490-695                                   Clothing manufacture.  Dressmaking.  Tailoring

TT697-927                                   Home arts.  Homecrafts

Including sewing, embroidery, decorative crafts

TT950-979                                   Hairdressing.  Beauty culture.  Barbers’ work

TT980-999                                   Laundry work


Subclass TX


TX1-1110                               Home economics

TX301-339                                    The house

Including arrangement, care, servants

TX341-641                                    Nutrition.  Foods and food supply

TX642-840                                    Cooking

TX851-885                                    Dining-room service

TX901-946.5                                 Hospitality industry.  Hotels, clubs, restaurants, etc.  Food service

TX950-953                                    Taverns, barrooms, saloons

TX955-985                                    Building operation and housekeeping

TX1100-1105                                Mobile home living


TX1110                                        Recreational vehicle living

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