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经营范围
发明名称
Mining machine
摘要
申请公布号
US2285862(A)
申请公布日期
1942.06.09
申请号
US19400364326
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
E21C29/24
主分类号
E21C29/24
代理机构
代理人
主权项
地址
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