| Business | Phone |
| Nuflo Measurment Systems 14450 John F Kennedy Blvd, Houston 77032 | (281) 582-9500 |
| Norcom Inc 10039 Bissonnet St 312a, Houston 77036 | (713) 774-9600 |
| Petron Industries Inc 5921 Thomas Rd, Houston 77041 | (713) 937-7982 |
| Walter Machine Co 1105 Upland Dr Y, Houston 77043 | (713) 461-3404 |
| Spectrum Chromatography Inc 15031 Woodham Dr 320, Houston 77073 | (281) 443-2900 |
| U S Connections Inc 6004 Breen Dr, Houston 77086 | (281) 272-2020 |
| Suntronic Electronic Assembly 10501 Kipp Way Dr 350, Houston 77099 | (281) 879-9562 |