| Business | Phone |
| Standard Electric Supply 960 Massachusetts Ave, Boston 2118 | (617) 442-1000 |
| Concord Electric Supply Ltd 383 Dorchester Ave, Boston 2127 | (617) 269-5552 |
| Graybar Electric Co 345 Harrison Ave, Boston 2118 | (617) 406-5000 |
| Hamamatsu Corp 236 Huntington Ave, Boston 2115 | (617) 536-6441 |