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发明名称
Clutch for drill heads
摘要
申请公布号
US2646147(A)
申请公布日期
1953.07.21
申请号
US19480053903
申请日期
1948.10.11
申请人
THE CRICHTON COMPANY
发明人
JR. ANDREW B. CRICHTON,;WENNERSTROM CARL G.
分类号
E21B3/035;F16D7/02
主分类号
E21B3/035
代理机构
代理人
主权项
地址
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