| Business | Phone |
| B & B Instruments Inc 1810 Broad Ripple Ave # 7, Indianapolis 46220 | (317) 251-3811 |
| Beck Technologies 7005 Corporate Cir, Indianapolis 46278 | (317) 773-1922 |
| Coleman Instrument Co 7998 Centerpoint Dr # 100, Indianapolis 46256 | (317) 570-7343 |
| Cornerstone Controls Inc 8525 Northwest Blvd, Indianapolis 46278 | (317) 870-2999 |
| Frakes Engineering 7950 Castleway Dr, Indianapolis 46250 | (317) 577-3000 |
| Havel Brothers 5128 W 79th St, Indianapolis 46268 | (317) 872-4242 |
| Temco 8902 Otis Ave # F107b, Indianapolis 46216 | (317) 329-5066 |
| Process Controls Corp 6519 Ferguson St, Indianapolis 46220 | (317) 259-1316 |
| Outbound Technologies 8501 Bash St # 100, Indianapolis 46250 | (317) 842-3500 |
| Peine Engineering Co 1440 W 30th St, Indianapolis 46208 | (317) 921-8000 |
| Jackson Control Co 1708 E 10th St, Indianapolis 46201 | (317) 231-2200 |