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  1. 1

    Progress report on investigation of detachable rock­drill bits.

    Published 1936
    “…I28.27..6877…”
    Full Text (via ProQuest)
    Government Document eBook
  2. 2

    Progress report on investigation of detachable rock­drill bits.

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