| Business | Phone |
| American Controls Corp 6120 W By Northwest Blvd 180, Houston 77040 | (713) 329-9100 |
| Control Automations Solutions 10532 Meadowglen Ln, Houston 77042 | (713) 789-0822 |
| Tour Andover Controls 10669 Richmond Ave 160, Houston 77042 | (713) 975-9500 |
| Adaptive Controls Inc 419 Century Plaza Dr 200, Houston 77073 | (281) 443-4991 |
| Analyzer Technology Intl Inc 2820 Broad St, Houston 77087 | (713) 641-4200 |
| Asi Instruments Inc 8570 Katy Fwy 1117, Houston 77024 | (713) 461-4535 |
| Babbitt International Inc 1330 Sherwood Forest St 205, Houston 77043 | (713) 467-4438 |
| Complete Controls Inc 1400 W Sam Houston Pkwy N 230, Houston 77043 | (713) 464-7002 |
| Design Controls 9885 Drysdale Ln, Houston 77041 | (713) 856-7444 |
| Constant Power Mfg 1729 Stebbins Dr 150, Houston 77043 | (713) 880-6200 |
| Johnson Controls Inc 2800 N Terminal Rd A, Houston 77032 | (281) 821-0123 |
| Johnson Controls Inc 501 Westlake Park Blvd, Houston 77079 | (281) 366-3865 |
| J D Instruments 10405 Town And Country Way, Houston 77024 | (713) 468-8087 |
| J W Long & Assoc Inc 4368 Gessner Dr, Houston 77041 | (713) 895-0644 |
| Sandelius Instruments 1407 W Patton St, Houston 77009 | (713) 861-1100 |
| Omexell Inc & Omexgroup Ltd 1400 Brittmoore Rd, Houston 77043 | (713) 973-9731 |
| Advantica Inc 5177 Richmond Ave 900, Houston 77056 | (713) 626-9568 |
| Thermo Probes Inc 55 Lyerly St 214, Houston 77022 | (713) 699-1393 |
| Smart Sensors Inc 1920 Aldine Western Rd, Houston 77038 | (281) 272-5333 |
| Safeplex Systems Inc 5213 Tacoma Dr B, Houston 77041 | (713) 983-8410 |
| W-Industries Inc 11500 Charles Rd, Houston 77041 | (713) 466-9463 |
| Sdrg Controls 8234 Braniff St, Houston 77061 | (713) 242-0822 |
| Solartron Inc 19408 Park Row 320, Houston 77084 | (281) 398-7890 |