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发明名称
Automatic clutch for drilling apparatus
摘要
申请公布号
US2167019(A)
申请公布日期
1939.07.25
申请号
US19370172134
申请日期
1937.11.01
申请人
A. O. SMITH CORPORATION
发明人
YOST LLOYD
分类号
E21B4/02;E21B17/04
主分类号
E21B4/02
代理机构
代理人
主权项
地址
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