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经营范围
发明名称
Mining machine
摘要
申请公布号
US2263925(A)
申请公布日期
1941.11.25
申请号
US19400364325
申请日期
1940.11.04
申请人
THE JEFFREY MANUFACTURING COMPANY
发明人
JEFFREY ROBERT K.;NICHOLS RICHARD D.
分类号
E21C31/12
主分类号
E21C31/12
代理机构
代理人
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地址
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