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发明名称
Casing pick-up elevator
摘要
申请公布号
US2164843(A)
申请公布日期
1939.07.04
申请号
US19380195798
申请日期
1938.03.14
申请人
SMITH WESSON W
发明人
SMITH WESSON W.
分类号
E21B19/06
主分类号
E21B19/06
代理机构
代理人
主权项
地址
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