| Business | Phone |
| Bjs Systems Inc 4407 S Kansas Ave, Milwaukee 53235 | (414) 481-8654 |
| Ecc Control 5722 W North Ave, Milwaukee 53208 | (414) 445-9111 |
| System Service Ltd 9055 N 51st St H, Milwaukee 53223 | (414) 354-7020 |
| National Utilities Co 12040 W Feerick St K, Milwaukee 53222 | (414) 358-4400 |
| Sterling 2900 S 160th St, Milwaukee 53223 | (414) 354-0970 |
| Patrick & Douglas Inc 8654 N 51st St, Milwaukee 53223 | (414) 354-0001 |