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  1. 1
    Cover Image

    Progress report on investigation of detachable rock­drill bits.

    Published 1936
    “…I28.27..6877…”
    Full Text (via ProQuest)
    Government Document eBook

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  2. 2
    Cover Image

    Progress report on investigation of detachable rock­drill bits.

    Published 1936
    “…I28.27..6877…”
    Full Text (via ProQuest)
    Government Document eBook

    Save to List
    Saved in:
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