| Business | Phone |
| Engineering Solutions & Prod 3310 E Central Texas Expy, Killeen 76543 | (254) 690-3133 |
| Killeen Engineering 2901 E Stan Schlueter Loop, Killeen 76542 | (254) 526-3981 |
| Engineering Solutions & Prod 4110 S Clear Creek Rd, Killeen 76549 | (254) 634-4999 |