| Business | Phone |
| Axiom Technologies Ltd 555 Consortium Crt, London N6E 2S8 | (519) 685-1540 |
| Hardie Industrial Svc 594 Newbold St, London N6E 2W9 | (519) 649-1433 |
| Jmp Engineering Inc 4026 Meadowbrook Dr #143, London N6L 1C9 | (519) 652-2741 |
| Johnson Controls Ltd 90 Bessemer Rd, London N6E 1R1 | (519) 681-1221 |
| G L Stebbins Co Ltd 2299 Dundas St, London N5V 1R4 | (519) 455-1350 |
| Numatics Limited 363 Sovereign Rd, London N6M 1A3 | (519) 452-1777 |
| Oes Inc 4056 Blakie Rd, London N6L 1P7 | (519) 652-5833 |
| R & R Instrumentation Svc Inc 24 Midale Cres, London N5X 3B9 | (519) 642-7197 |
| Siemens Building Tech Ltd 601 Consortium Crt, London N6E 2S8 | (519) 668-2392 |
| T R Controls Inc 955 Green Valley Rd, London N6N 1E4 | (519) 452-1999 |
| Chartwell Electronics London 1274 Blackmaple Dr, London N5Y 5V4 | (519) 433-9430 |
| Control Systems Inc 5 Bayview Crt #3, London N5W 5W4 | (519) 453-4100 |
| Davis Controls Ltd 30 Park Lane Cres, London N6K 2T8 | (519) 641-8953 |
| Deem Controls Inc 266 Oxford St E #102, London N6A 1V1 | (519) 858-0164 |
| Durell Control Systems Inc 3392 Wonderland Rd S #1, London N6L 1A8 | (519) 652-5502 |