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Modern automatic electrically controlled elevators for transporting men at two coal mines in Western Pennsylvania
| Author: | Holcomb, J. W. |
|---|---|
| Year: | 1952 |
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
| SUDOC: | I 28.27:7628 |
| Series: | Information circular / United States. Bureau of Mines ; |
| Report Number: | 7628 |
| Subjects: | Coal mines and mining--Pennsylvania |
| Elevators | |
| Hoisting machinery--Pennsylvania | |
| Link: | https://hdl.handle.net/2027/mdp.39015078455956 |
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