| Business | Phone |
| Arthur Schock Engineers 1016 Greentree Rd # 203, Pittsburgh 15220 | (412) 919-0133 |
| Bert Davis & Assoc 19 35th St, Pittsburgh 15201 | (412) 682-3603 |
| Delrad 4707 Meadowgreen Dr, Pittsburgh 15236 | (412) 882-5212 |
| Dodson Engineering Inc 112 Washington Pl, Pittsburgh 15219 | (412) 261-6515 |
| Forefront Engineering & Design 300 Penn Center Blvd, Pittsburgh 15235 | (412) 816-1966 |
| Fortier Engineering 1824 Murray Ave, Pittsburgh 15217 | (412) 521-1880 |
| John R George Pe 534 Clemson Dr, Pittsburgh 15243 | (412) 279-0997 |
| Alan A Glaser 27 Kingston Ave, Pittsburgh 15205 | (412) 922-7866 |
| J Graner Engineering Svc Inc 3986 Tuxey Ave, Pittsburgh 15227 | (412) 886-9120 |
| Jacob Engineering & Sales Co 51 Hauck Dr # 51, Pittsburgh 15235 | (412) 731-0800 |
| Pressure Sciences Inc 1680 Beechwood Blvd, Pittsburgh 15217 | (412) 521-4006 |