| Advance | Feedrail | Osram/Sylvania |
| Airmaster | Fenwall | OZ Gedney |
| Allen Bradley | Firex | Panduit |
| Alpha Wire | Fixrammer | Paragon |
| American Electric | Fluke | Pass And Seymour |
| American Insulated Wire | General Electric | Pfaff & Kendall |
| Amprobe | Gould-Shawmut | Phillips Lighting |
| Appleton | Greenlee | Photoswitch |
| Arlington | Heave-Duty Transformer | Plye National Co. |
| Arrow Hart | Holophane Lighting | Plymouth Tape |
| ASCO | Holub Industries | Porcelain Products |
| Atlite | Honeywell Inc. | Potter & Brumfield |
| Austin | Hubbell Lighting | Power Lighting |
| Belden | Hubbell | Progress Lighting |
| Benjamin Electric Co. | Ideal Data-Com | Q-Mark |
| Big Beam | Ideal Industries | Rab |
| Blackburn | Ilsco | Raco |
| Brady | Industrial Timer Corp. | Rawl Fasteners |
| Bridgeport | Intermatic | Red Dot |
| Bright Star | Intertherm | Republic Steel |
| BRK | Jefferson Transformer | Robertshaw |
| Broan | Kellems | Rockbestos |
| Bryant Electric | Kenall Fixtures | Royal |
| Burndy | Kichler Lighting | Russell & Stoll |
| Bussman | Kindorff | Safety - Lite |
| Cable | Klein | Scepter |
| Caddy | Korn (clamps) | Scotch - Tapes |
| Carling Electric Co. | Lamar Lighting | Seagull |
| Carlon | Lee Electric | Sealtite |
| Carol Cable | Lee-Dan | Sentinel Heaters |
| Carpenter | Lem Markers | Shawmut |
| Carrier | Levition Manufacturing | Sim-Kar |
| Cerro Wire | Lightalarms | Simpson Instruments |
| Chelsea Fan & Blower Co. | Lightolier | SL Waber |
| Chromalox | Line Material Corp. | Sperry |
| Circle D | Linemaster (Footswitches) | Square D |
| Cooper Lighting | Littlefuse | Steel City |
| Craftmade Fans | Luminous Ceiling Corp. | Stonco |
| CRC- Industries | Lutron | Sure-Lite |
| Cutler Hammer | Luxo Lamps | Swivelier |
| Dual-Lite | MAC Products | Sylvania |
| Dura Cell | Magnetek | T&B Omnilink |
| Eagle Signal Timers | Maple Chase | Taymac |
| Eagle | Markel Products | Thomas & Bett |
| Edwards | Marktime | Thomas Lighting |
| Electriduct | McGill | Tork |
| Electromode | Mercoid Switches | Unistrut |
| Emerson Electric | Mercury Lighting | Universal Manufacturing / Magnetek |
| Emerson Fans | Micro Switch | Versabar |
| E-mon Meters | Milwaukee | Waage Electric Mfg. |
| Essex Wire | Milwaukee Tools | Wac Lighting |
| Eveready | Minerallac | Walker |
| Exide | 3M | Ward Leonard Electric Co. |
| Faraday | Mueller Clips | Weigman |
| Fastoria | Mulberry Products | Westinghouse Electric Co. |
| NSI Lighting | Wiegmann |
| Nutone | Wiremold |
| Olympic Wire | Woodhead |
| | Zenith Controls |
