| Business | Phone |
| Allied Signal Aerospace 4387 International Gtwy, Columbus 43219 | (614) 231-1938 |
| Asco Aeronautical Inc 112 Edgevale Rd, Columbus 43209 | (614) 338-8683 |
| Plane Lock Co 381 S Drexel Ave, Columbus 43209 | (614) 879-4111 |
| De Crane Aircraft Holdings Inc 8425 Pulsar Pl, Columbus 43240 | (614) 848-7700 |