| Business | Phone |
| Henderson Industries 2081 Oxford St E, London N5V 2Z7 | (519) 451-9920 |
| La Mantia Products 1663 Jubilee Dr, London N6G 5K4 | (519) 472-5566 |
| Lab-A-Tron Electronic Systems 340 Saskatoon St, London N5W 4R3 | (519) 455-2597 |
| Oci Vacuum Microengineering 340 Saskatoon St, London N5W 4R3 | (519) 457-0878 |
| Sparton Of Canada Ltd 99 Ash St, London N5Z 4V3 | (519) 455-6320 |
| Cda Systems Ltd 481 Baker St, London N6C 1Y1 | (519) 438-2280 |
| De Vries Electronics 315 Neptune Cres, London N6M 1A9 | (519) 452-1733 |
| Elkor Technologies Inc 6 Bainard St, London N6P 1A8 | (519) 652-9959 |