Permissible electrically operated hand-held coal drills /
| Main Author: | |
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| Corporate Author: | |
| Other Authors: | , |
| Format: | Government Document Book |
| Language: | English |
| Published: |
[Washington, D.C.] :
U.S. Dept. of the Interior, Bureau of Mines,
1937
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| Series: | Report of investigations (United States. Bureau of Mines)
3363 |
| Subjects: |