| Company | CLINTON IRON AND STEEL COMPANY |
| Business Number | 7183 |
| Company | CONSOLIDATED IRON WORKS |
| Business Number | 5469 |
| Company | THE NATIONAL PIPE BENDING COMPANY |
| Business Number | 3834 |
| Company | BIRMINGHAM IRON FOUNDRY |
| Business Number | 2450 |
| Company | THE BARNARD ENGINEERING COMPANY |
| Business Number | 1344 |
| Company | ROY VALVE COMPANY |
| Business Number | 1340 |
| Company | THE BIGELOW COMPANY |
| Business Number | 8438 |