| | Gilson Co Inc (Lewis Center, OH) Sampling, plastic flow & particle size analysis, concrete & asphalt density testing & laboratory equipment, instruments | |
| | Goldman Products Inc (Island Lake, IL) Dental instruments | |
| | H & H Instruments Inc (Saint Augustine, FL) Surgical instruments & precision machined components | |
| | Haydu, Z Manufacturing Corp (Hollywood, FL) Dental instruments & medical products | |
| | Huntington Instruments Inc (Yellow Springs, OH) Control instruments | |
| | Huygen Corp (Wauconda, IL) Analytical & electronic instruments | |
| | Ideal Instruments Inc (Schiller Park, IL) Manufactures veterinarian instruments | |
| | Instrumentors Inc (Strongsville, OH) Laboratory instruments | |
| | Kuhlman Instruments Co (Norwalk, OH) Instruments to measure pressure & leak detect miniature plug shut off valves, digital & gas leak sensor | |
| | Laurel Industries (Highland Park, IL) Optical & precision instruments; lenses, prisms, laser systems & accessories | |
| | Lehighton Electronics Inc (Lehighton, PA) Nondestructive sheet resistance measurement instruments, carrier concentration versus depth profilers & Hg probes | |
| | Ludlum Associates Co (Lakeland, FL) Instrument controls, wire & cable, temperature instruments, heating units & devices | |
| | Machining Concepts Inc (Warsaw, IN) Orthopedic surgical & medical instruments | |
| | Magnaflux (Glenview, IL) Manufactures nondestructive testing equipment, materials & instruments | |
| | Masel Enterprises (Bristol, PA) Dental instruments | |
