| Business | Phone |
| Classic Engineering Inc 108 Badger Park Dr, Jacksonville 32259 | (904) 808-8780 |
| Michael G Holder Inc 144 Arlington Rd S # 3, Jacksonville 32216 | (904) 721-7676 |
| Horizon Engineering & Testing 5875 Mining Ter, Jacksonville 32257 | (904) 260-7075 |
| J Collins Engrg Assoc Llc 11516 San Jose Blvd, Jacksonville 32223 | (904) 262-4121 |