| Business | Phone |
| Cincinnati Valve Co 1901 Dalton Ave, Cincinnati 45214 | (513) 721-1942 |
| Computer System Enhancement 927 Kreis Ln, Cincinnati 45205 | (513) 251-6791 |
| Controlco Inc 10937 Reed Hartman Hwy # A, Cincinnati 45242 | (513) 792-0330 |
| Cornerstone Controls Inc 7251 E Kemper Rd, Cincinnati 45249 | (513) 489-2500 |
| North Coast Instruments 458 Blossom Ln, Cincinnati 45244 | (513) 528-7158 |
| Lunkenheimer Co 1500 Waverly Ave, Cincinnati 45214 | (513) 244-5291 |
| Nightwine & Assoc 8374 Wetherfield Ln, Cincinnati 45236 | (513) 745-0925 |
| Tech-Line Co 7079 Bridges Rd, Cincinnati 45230 | (513) 232-3600 |