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发明名称
Oil-well device
摘要
申请公布号
US1802612(A)
申请公布日期
1931.04.28
申请号
US19280315296
申请日期
1928.10.26
申请人
MACGREGORSTRANG, INC.
发明人
MACGREGOR LAURENCE B.
分类号
E21B37/08
主分类号
E21B37/08
代理机构
代理人
主权项
地址
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