| Business | Phone |
| Casne Engineering 609 N Argonne Rd B, Spokane 99212 | (509) 922-7897 |
| G E Com 3808 N Sullivan Rd G, Spokane 99216 | (509) 891-1511 |
| Nac Engineering 1203 W Riverside Ave, Spokane 99201 | (509) 624-8125 |
| Pennell Consulting 202 E Trent Ave, Spokane 99202 | (509) 747-1888 |
| Russell Electrical Consulting 4128 W Northwest Blvd, Spokane 99205 | (509) 327-0446 |
| Summit Pro Engineering 22 W Indiana Ave, Spokane 99205 | (509) 323-1563 |
| Virtual Technologies Ltd 3815 S Union Rd, Spokane 99206 | (509) 244-3252 |