| Business | Phone |
| B & L Precision Machining 1741 Myrtle Ave, Napa 94558 | (707) 253-8874 |
| Tschida Engineering Inc 1812 Yajome St, Napa 94559 | (707) 224-4482 |
| Bickford Precision Mchn & Dsgn 1760 Industrial Way, Napa 94558 | (707) 253-0846 |
| Burch Micro Machining 1790 Tanen St, Napa 94559 | (707) 257-7229 |