| | Dart Controls Inc (Zionsville, IN) AC & DC voltage controls, DC motors & digital speed indicators | |
| | Dento-Profile Scale Co (Fond Du Lac, WI) Dental measuring devices & sore spot indicators; scales for the dental industry | |
| | Diack Inc (Beulah, MI) Sterilizer controls & chemical indicators | |
| | E O Schweitzer Manufacturing (Mundelein, IL) Manufactures power line fault indicators & instrument transformers | |
| | Electronic Concepts & Engrg (Holland, OH) Manufacture parachute operation indicators | |
| | ERDCO Engineering Corp (Evanston, IL) Flow indicators & meters | |
| | Gem Instrument Co (Brunswick, OH) Mechanical measuring devices & dial indicators | |
| | I C M I (Amelia, OH) Modules, electronic controls, indicators, monitors & printed circuit timers | |
| | Inair Aviation Services Co (Indianapolis, IN) Repair computers & indicators for air craft industry | |
| | Instrulab Inc (Dayton, OH) Data loggers, digital temp indicators & systems | |
| | J & M Turner Inc (Southampton, PA) Direct tension indicators | |
| | Jansson, A A Inc (Detroit, MI) Calibrating service, metric tooling & instrument repairing: gauges, indicators & optical equipment | |
| | Lighting Components & Design (Deerfield Beach, FL) Lighting components; standard & custom lampholders; neon, incandescent & LED panel mount indicator lights; optoelectronic circuit board, modular array indicators & wiring harnesses & assembly | |
| | Machine Products Corp (Dayton, OH) Electric motor manufacturing equipment & visual flow indicators | |
| | Mack Electric Devices Inc (Wyncote, PA) Temperature monitors, thermostats, controls & indicators | |
