| | Quartz Scientific Inc (Fairport Harbor, OH) Fabricated fused quartz products | |
| | Quartz Tubing Inc (Bensalem, PA) Quartz heating elements | |
| | Raltron Electronics Corp (Miami, FL) Quartz crystals, oscillators, DIP switches, filters & resistors networks | |
| | Sawyer Research Products Inc (Eastlake, OH) Cultured quartz crystals | |
| | Scientific Glass Of Florida (Sanford, FL) Semiconductor quartz | |
| | Tate-Jones Inc (Pittsburgh, PA) Valves, observation & furnace ports, quartz & heat resistant lenses | |
| | Technical Glass Products Inc (Painesville, OH) Manufacture quartz crystal | |
| | Tellurian Technologies Inc (Rolling Meadows, IL) Quartz crystal clock oscillators | |
| | TRANSAT Corp (Solon, OH) Quartz crystal processing & measuring equipment | |
| | Quartz Scientific, Inc. (Fairport Harbor, OH) | |
| | Jelight Company Inc. (Irvine, CA) | |
| | Falat Sang Asia L.L.C (Dubai, United Arab Emirates) | |
