| 517111 |
Online access service providers, using own operated wired telecommunications infrastructure |
| 517111 |
Satellite master antenna television service (SMATV) |
| 517111 |
Satellite television distribution systems |
| 517111 |
Telecommunications carriers, wired |
| 517111 |
Television operations, closed-circuit |
| 517111 |
VoIP service providers, using own operated wired telecommunications infrastructure |
| 517112 |
Beeper (i.e., radio pager) communication carriers |
| 517112 |
Cellular telephone communication carriers |
| 517112 |
Cellular telephone service carriers |
| 517112 |
Mobile telephone communication carriers (except satellite) |