| Business | Phone |
| Affiliated Engineering Tech 5635 Horning Rd, Pittsburgh 15236 | (412) 655-7456 |
| Bechtel Corp 2304 Salem Dr, Pittsburgh 15237 | (412) 367-4424 |
| Cdm Constructors 2740 Smallman St, Pittsburgh 15222 | (412) 201-5510 |
| Management Engineering Corp Pittsburgh Intl Airport, Pittsburgh 15231 | (412) 472-5355 |
| Markay Engineering Corp 1018 Wilkins Heights Rd, Pittsburgh 15217 | (412) 683-1006 |