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发明名称
Rotary disk drill
摘要
申请公布号
US1789834(A)
申请公布日期
1931.01.20
申请号
US19270211480
申请日期
1927.08.08
申请人
PAULSEN HENRY M
发明人
PAULSEN HENRY M.
分类号
E21B10/12;E21B10/16
主分类号
E21B10/12
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代理人
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