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  • All fields: Drilling & boring machinery--1900-1930.
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    • Bloc holing

    • A miner stands next to a large rock which he is bloc holing with a pneumatic drill in an unidentified mine somewhere in Colorado. The miner wears boots, denim overalls, gloves, and a head lamp.
    • Drilling & boring machinery--1900-1930.; Interiors--1900-1930.; Miners--1900-1930.; Mining--1900-1930.
    • [between 1900 and 1930?]

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