| Business | Phone |
| A B Bauer 627 E Monroe Ave, Orange 92867 | (714) 538-2224 |
| Alan & Assoc 4520 E Blue Bird Ave, Orange 92869 | (714) 878-7409 |
| C & E Engineering & Constr 1855 W Katella Ave, Orange 92867 | (714) 630-8797 |
| Cooper Engineering Inc 764 N Cypress St, Orange 92867 | (714) 744-0220 |
| Flat Out Engineering 633 W Katella Ave # K, Orange 92867 | (714) 639-2623 |
| Industrial Engineering Svc 6606 E Joshua Tree Ave, Orange 92867 | (714) 998-6444 |
| Picone Engineering 978 N Lemon St, Orange 92867 | (714) 771-7777 |