Establishments primarily engaged in furnishing telegraph and other nonvocal message communications services, such as cablegram, electronic mail, and facsimile transmission services.
- Cablegram services
- Electronic mail services
- Facsimile transmission services
- Mailgram services
- Photograph transmission services
- Radio telegraph services
- Telegram services
- Telegraph cable services
- Telegraph services
- Teletypewriter services
- Telex services