| Business | Phone |
| Joe Johnson Engineering 36 W Beauregard Ave, San Angelo 76903 | (325) 482-8383 |
| Power Systems 1009 Churchwell Rd, San Angelo 76905 | (325) 486-9200 |
| Skg Engineering 1122 S Bryant Blvd, San Angelo 76903 | (325) 655-1288 |
| Southwest Engineering Co 1530 Darlene St, San Angelo 76904 | (325) 949-6603 |