| Business | Phone |
| Applied Engineering Inc 708 Fiero Ln # 12, San Luis Obispo 93401 | (805) 544-5684 |
| Buehler & Buehler Inc 4110 Broad St, San Luis Obispo 93401 | (805) 782-0200 |
| Davar Engineering 1103 Johnson Ave, San Luis Obispo 93401 | (805) 542-0670 |
| H F Mager Inc 1149 Marsh St, San Luis Obispo 93401 | (805) 541-2193 |
| Lampman & Smith 805 Aerovista Pl # 204, San Luis Obispo 93401 | (805) 544-9173 |