| Business | Phone |
| Black Diamond Energy Inc 410 Mount Nebo Rd, Pittsburgh 15237 | (412) 369-7855 |
| Mining Connector Manufacting 1625 Moynelle Dr, Pittsburgh 15243 | (412) 279-7370 |
| Penna Mining Machine Corp 1 Thomas Ln, Pittsburgh 15235 | (412) 825-0477 |
| Union Mining Co Inc Pittsburgh Benedum-Trees Bldg, Pittsburgh 15219 | (412) 281-9902 |