| SIC Code | Business or Product | Registrants |
|---|
|  | | |
| 3677 | Transformers, electronic types | 9 |
| 3612 | Transformers, for electronic meters | 23 |
| 3825 | Transformers, instrument: portable | 93 |
| 3612 | Transformers, reactor | 23 |
| 3677 | Transformers: power supply electronic type | 9 |
| 7221 | Transient photographers | * |
| 3674 | Transistors | 547 |
| 5065 | Transistors – wholesale | 91 |
| 7319 | Transit advertising | 1 |
| 9621 | Transit systems and authorities – nonoperating | – |
| 3829 | Transits, surveying | 131 |
| 7389 | Translation service | 2,045 |
| 5063 | Transmission equipment, electrical – wholesale | 36 |
| 2992 | Transmission fluid – made from purchased materials | * |
| 3714 | Transmission housings and parts, motor vehicle | 366 |
| 1623 | Transmission line construction-general contractors | 37 |
| 7537 | Transmission repair, automotive | * |
| 3728 | Transmissions, aircraft | 158 |
| 7537 | Transmissions, automotive: installation, repair, or sale and installation | * |
| 3714 | Transmissions, motor vehicle | 366 |
________
* There are SEC Registrants, but only at the 2- or 3-digit SIC Code levels. |
