| TK | Electrical engineering. Electronics. Nuclear engineering |
| 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 |
| TK5101-6720 | Telecommunication. Including telegraphy, telephone, radio, radar, television |
| TK7885-7895 | Computer engineering. Computer hardware |
| TK8300-8360 | Photoelectronic devices (General) |
| TK9001-9401 | Nuclear engineering. Atomic power |
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