| Business | Phone |
| Alpha Engineering Inc 842 Corporate Way # 820, Cleveland 44145 | (440) 333-6040 |
| Brennan Htg & Air 1550 E 33rd St, Cleveland 44114 | (216) 621-5452 |
| Great Lakes Welding & Boiler 5716 Brookpark Rd, Cleveland 44129 | (216) 459-0400 |
| M M Berger & Assocs Inc 20862 Byron Rd, Cleveland 44122 | (216) 991-7550 |
| National Boiler Works 4556 Industrial Pkwy, Cleveland 44135 | (216) 377-1700 |