- E-Systems Inc.-Greenville Div.
- Terrafix
- Com Center Corp.
- Litton - Denro
- Koning En Hartman
- Thales (Racal)
- T.C.C.
- Zetron
- Data Radio Corp.

- PAGING SYSTEM MANUFACTURERS:

- Glenayre
- NEC
- Quintron
- Swissphone
- Zetron

- TOWERS, ANTENNA, CABLES AND ACCESSORIES MANUFACTURERS:

- Antenna Specialist Products
- Andrews Corp.
- C.S.A.
- Celwave
- DB Products
- Jaybeam
- Jennis & LeBlanc (Currently Al Babtain LeBlanc)
- Kabelmetal
- Kathrein
- Phelps Dodge
- Transradio
- UNR Rohn