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发明名称
Device for use in uncoupling drill steels
摘要
申请公布号
US2976943(A)
申请公布日期
1961.03.28
申请号
US19570696250
申请日期
1957.11.13
申请人
JOY MANUFACTURING COMPANY
发明人
CURTIS JOHN C.
分类号
E21B19/16
主分类号
E21B19/16
代理机构
代理人
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地址
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