| Business | Phone |
| Bickett Engineering 150 Hughes Rd # 101, Grass Valley 95945 | (530) 477-9960 |
| Core Dvs 15875 Gibboney Ln, Grass Valley 95949 | (530) 477-6188 |
| Lunatec Inc 152 Mill St # D, Grass Valley 95945 | (530) 273-2513 |
| Maven Engineering 10851 Lime Kiln Rd, Grass Valley 95949 | (530) 268-9577 |