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Subclass TK
| TK1-9971 | Electrical engineering. Electronics. Nuclear engineering | ||
| TK301-399 | Electric meters | ||
| TK452-454.4 | Electric apparatus and materials. Electric circuits. Electric networks | ||
| TK1001-1841 | Production of electric energy or power. Powerplants. Central stations | ||
| 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 | ||
