Rock drill

申请公布号：US1846819(A)

申请号：US19280324726

申请日期：1928.12.08

申请公布日期：1932.02.23

申请人：

INGERSOLL-RAND COMPANY

发明人：SR. WILLIAM A. SMITH,

分类号：B25D17/26

主分类号：B25D17/26

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