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发明名称
Pipe pulling device
摘要
申请公布号
US2820607(A)
申请公布日期
1958.01.21
申请号
US19560605991
申请日期
1956.08.24
申请人
DAWES CYRIL F
发明人
DAWES CYRIL F.
分类号
E21B19/00
主分类号
E21B19/00
代理机构
代理人
主权项
地址
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