| 1321 | Transfer Pump Panel | Company Product |
| 1322 | Transfer Switches | Company Product |
| 1323 | Transformer & Converters | Company Product |
| 1324 | Transformer Maintenance | Company Product |
| 1325 | Transformer Oils | Company Product |
| 1326 | Transformer Ratio Meters | Company Product |
| 1327 | Transformer Repair | Company Product |
| 1328 | Transformer Turns Ratio Meters | Company Product |
| 1329 | Transformers | Company Product |
| 1330 | Transistor Testing Equipment | Company Product |
| 1331 | Transistors | Company Product |
| 1332 | Transit Mixers | Company Product |
| 1333 | Transit Time Ultrasonic Flowmeter | Company Product |
| 1334 | Translation Services | Company Product |
| 1335 | Translators & Interpreters | Company Product |
| 1336 | Translators' Systems & Equipment | Company Product |
| 1337 | Transmission Filter | Company Product |
| 1338 | Transmission Gear Box | Company Product |
| 1339 | Transmission Jacks | Company Product |
| 1340 | Transmission Oil | Company Product |
| 1341 | Transmission Overhauls | Company Product |
| 1342 | Transmission Parts | Company Product |
| 1343 | Transmission Pumps | Company Product |
| 1344 | Transmission System | Company Product |
| 1345 | Transmissions | Company Product |
| 1346 | Transmitter | Company Product |
| 1347 | Transmitter (process) | Company Product |
| 1348 | Transmitters | Company Product |
| 1349 | Transparency Film | Company Product |
| 1350 | Transparency Makers | Company Product |