- Air Monitor Corp
- Air Preheater Co
- All Seasons Air Conditioning
- AOS Inc
- Baker Industrial Equipment Inc
- Baldwin Environmental
- Buxmont Endocrinology
- Comag IR Inc
- Demtrol Systems
- DGA
- Eco Sensors Inc
- GE Energy
- Infrared Analysis
- Infrared Analysis
- Instrumentation Products Co
- Interscan Corp
- Northwest Instruments & Cntrls
- Polytrace Systems
- Rocky Mountain Instrumentation
- Rocky Mountain Instrumentation
- Scientific Industries Inc
- Teledyne Monitor Labs
- Universal Analyzers Inc
