| Business | Phone |
| Ast Engineering 1495 W 9th St # 505, Upland 91786 | (909) 946-0683 |
| C & S Engineering 1820 W 11th St # G, Upland 91786 | (909) 949-1596 |
| Castro Brothers Machine 1551 Howard Access Rd # C, Upland 91786 | (909) 920-4220 |
| Jade Products Inc 1685 W Arrow Rte # 2, Upland 91786 | (909) 981-6552 |
| Jb Machine Inc 1656 W 9th St # D, Upland 91786 | (909) 981-0990 |
| L-Tek 1656 W 11th St, Upland 91786 | (909) 608-0485 |
| Lemco 1842 W 11th St # A, Upland 91786 | (909) 949-1181 |
| Miles Consulting 1529 W 13th St # K, Upland 91786 | (909) 981-1707 |
| Ott Precision Machining 1658 W 11th St # J, Upland 91786 | (909) 946-0862 |
| P & W Machine Works 1933 W 11th St, Upland 91786 | (909) 982-5162 |
| R J Olchawa Machine Shop Svc 8435 Loma Pl, Upland 91786 | (909) 982-3170 |
| Roller Technologies Co 923 N Central Ave, Upland 91786 | (909) 949-3015 |
| Western Feed Screw Co 960 W 9th St, Upland 91786 | (909) 944-8113 |
| Wilson Brothers Grinding 8445 Loma Pl, Upland 91786 | (909) 949-2911 |
| Custom Performance Engines 1302 Monte Vista Ave # 13, Upland 91786 | (909) 931-4612 |
| Mac Industries 1134 W 9th St, Upland 91786 | (909) 982-3431 |