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发明名称
Rotary machine
摘要
申请公布号
US2252618(A)
申请公布日期
1941.08.12
申请号
US19390260860
申请日期
1939.03.09
申请人
THE WHELAND COMPANY
发明人
CAMPBELL GEORGE E.
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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