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发明名称
Drive mechanism for rotary drill pipe
摘要
申请公布号
US1798523(A)
申请公布日期
1931.03.31
申请号
US19290331412
申请日期
1929.01.10
申请人
CROWELL ERD V
发明人
CROWELL ERD V.
分类号
E21B3/04
主分类号
E21B3/04
代理机构
代理人
主权项
地址
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