| Business | Phone |
| Hammond Enterprises 559 Garcia Ave # B, Pittsburg 94565 | (925) 432-3537 |
| Delta Machine Co 1436 Bobo Ct, Pittsburg 94565 | (925) 439-1300 |
| Pettas Enterprises 1436 Bobo Ct, Pittsburg 94565 | (925) 439-0404 |
| Pittsburg Precision Manufacturer 520 Garcia Ave # F, Pittsburg 94565 | (925) 473-9263 |