| | Harris Corp (Quincy, IL) Radio & TV broadcasting equipment; communication & industrial antennas | |
| | Illinois Communications Co (Chicago, IL) Distributes telecom equipment; company installs & services cellular telephones & pagers & two-way company radio equipment | |
| | Illinois Communications Co (Evergreen Park, IL) Distributes telecom equipment; company installs & services cellular telephones & pagers & two-way company radio equipment | |
| | Johnson, E F International (Miami, FL) Radio communication equipment | |
| | King-Fisher Co (Wheeling, IL) Fire protection equipment & radio fire alarm systems | |
| | Kritronics Inc (Pittsburgh, PA) Radio communication tower equipment | |
| | LPB Communications Inc (Frazer, PA) Radio broadcast & communication systems & equipment; lower AM transmission equipment; antennas & accessories | |
| | Maranatha Industries Inc (Payne, OH) Radio equipment & parts | |
| | Mentor Radio Co (Willoughby, OH) Aeronautical ground, radio equipment & airport lighting equipment | |
| | Northway Communications Inc (Wausau, WI) Service, installation & sales: two-way radio equipment; maintenance: electronic equipment used in industry & public safety | |
| | Nycomed Amersham (Arlington Hts, IL) Research & development: laboratory; research & test products; life science, radio pharmaceuticals, radiography equipment, quality & safety assurance | |
| | Radio Communication Service (Eddystone, PA) Electronic parts & equipment distributor; 2-way land radio repair service | |
| | Raytheon Systems Co (St Petersburg, FL) High technology communication equipment & radio components | |
| | Rich Electronics Inc (Miami, FL) Industrial & marine radio navigation aids, desalinization equipment & on-board vessel monitoring computer systems | |
| | Sinco Engineering (Orlando, FL) Radio & TV communication equipment | |
