| Business | Phone |
| Ajax Industries Ltd 5830 N 95th Ct, Milwaukee 53225 | (414) 463-3600 |
| Atlas Heating & Sheet Metal 1414 W Fond Du Lac Ave, Milwaukee 53205 | (414) 342-7818 |
| Doral Corp 427 E Stewart St, Milwaukee 53207 | (414) 489-7000 |
| Old Sheet Metal Shop Inc 2585 S 33rd St, Milwaukee 53215 | (414) 383-0043 |