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发明名称
Valve for mining machines
摘要
申请公布号
US2427859(A)
申请公布日期
1947.09.23
申请号
US19440543789
申请日期
1944.07.07
申请人
THE JEFFREY MANUFACTURING COMPANY
发明人
JEFFREY FLORENCE H. C.
分类号
E21C31/12
主分类号
E21C31/12
代理机构
代理人
主权项
地址
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