| Business | Phone |
| Applied Control Equipment 943 Tate Cir, Billings 59105 | (406) 252-9070 |
| Encode Corp 111 Florine Ln, Billings 59101 | (406) 245-2520 |
| Industrial Controls 547 S 20th St W # 8, Billings 59102 | (406) 656-0431 |
| Johnson Controls Inc 1537 Avenue D # 150, Billings 59102 | (406) 256-5245 |