The Shift Boss Keeping holes out of the wall rock was a problem for the shift boss then as it is today. To insure that the miner drilled only the ore, the boss marked the hole with the smoke of his lamp.
- Shift boss
- DC Type
- Is Part Of
- Conversion Specifications
- TIFF scanned at 400 dpi on Epson Expression 10000X using EPSON Scan Ver. 2.94A.
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