| Business | Phone |
| Advance Controls & Automation 14620 Hempstead Rd, Houston 77040 | (713) 462-7381 |
| Control Products 17415 Village Green Dr, Houston 77040 | (713) 849-7200 |
| Devin Systems Co 15602 Shanghai St, Houston 77040 | (713) 937-7161 |
| Drake Controls 5227 Langfield Rd, Houston 77040 | (713) 996-0190 |
| Johnson Controls Inc 10130 W Gulf Bank Rd, Houston 77040 | (713) 896-0189 |
| Johnson Controls Inc 9001 Jameel Rd 100, Houston 77040 | (713) 332-3141 |
| Opentech 17401 Village Green Dr, Houston 77040 | (713) 983-6500 |
| Agar Corp/En-Fab 3905 Jensen Dr, Houston 77026 | (713) 228-1203 |
| Accurate Controls Inc 4911 Fulton St, Houston 77009 | (713) 699-3726 |
| Ace Panel Engineering 8565 Mosley Rd, Houston 77075 | (713) 943-8414 |
| Krohne Oil & Gas 12727 Featherwood Dr 123, Houston 77034 | (713) 436-3945 |
| Allesco 14375 Sommermeyer St, Houston 77041 | (713) 462-6200 |
| Askco Instruments 7598 Morley St, Houston 77061 | (713) 645-9898 |
| Automated Air Svc Inc 14355 East Fwy, Houston 77015 | (713) 453-4929 |
| Bristol Inc 2000 W Governors Cir F, Houston 77092 | (713) 685-6200 |
| C I Systems Inc 2202 Enchanted Isle Dr, Houston 77062 | (281) 286-9200 |
| Class 1 Controls Inc 1720 Elmview Dr, Houston 77080 | (713) 467-8397 |
| Compressor Controls Corp 8824 Fallbrook Dr, Houston 77064 | (281) 583-7799 |
| Control Devices Inc 11947 Brook Mdw, Houston 77060 | (281) 272-9100 |
| Control Elements Inc 709 Studewood St, Houston 77007 | (713) 868-3391 |
| Dabec Technology Po Box 750543, Houston 77275 | (713) 991-7708 |
| Dawson & Assoc 525 N Sam Houston Pkwy E 350, Houston 77060 | (281) 272-1717 |
| Digital Air Control 3330 Bering Dr, Houston 77057 | (713) 975-8160 |
| Emc Controls Inc 8100 Blankenship Dr, Houston 77055 | (713) 647-9100 |
| Endress & Hauser Inc 600 Kenrick Dr B14, Houston 77060 | (281) 999-1991 |
| Gefco Industrial Products Inc Houston 77008 | (713) 426-5260 |
| Mcl Control Usa Inc 2611 Fm 1960 Rd W H220, Houston 77068 | (281) 583-9378 |
| Gulf Coast Ignition & Controls 6830 N Eldridge Pkwy 405, Houston 77041 | (832) 467-4600 |
| Magnesonic Corp 10700 Hammerly Blvd, Houston 77043 | (713) 827-8795 |
| Houston Circuit Breaker 8920 Lawndale St, Houston 77012 | (713) 923-6717 |
| K-Tek Texas Gulf Coast Office 8570 Katy Fwy, Houston 77024 | (713) 461-5842 |
| Intech Process Automation Inc 16840 Barker Springs Rd C30, Houston 77084 | (281) 398-1100 |
| Interface Products Corp 13331 Veterans Memorial Dr, Houston 77014 | (281) 440-9814 |
| Enraf Inc 4333 W Sam Houston Pkwy N 190, Houston 77043 | (832) 467-3422 |
| N S Controls Inc 5601 W Sam Houston Pkwy N, Houston 77041 | (713) 465-7591 |
| Neostar Controls Inc 14530 Wunderlich Dr 200, Houston 77069 | (281) 444-3300 |