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发明名称
Pipe gripping device
摘要
申请公布号
US1908421(A)
申请公布日期
1933.05.09
申请号
US19310580206
申请日期
1931.12.10
申请人
HEGGEM ALFRED G
发明人
HEGGEM ALFRED G.
分类号
E21B19/10
主分类号
E21B19/10
代理机构
代理人
主权项
地址
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