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发明名称
Apparatus for conveying from the working face in mines
摘要
申请公布号
US1781259(A)
申请公布日期
1930.11.11
申请号
US19280299349
申请日期
1928.08.13
申请人
ARTHUR WELSH;GEORGE RAW
发明人
WELSH ARTHUR;RAW GEORGE
分类号
E21F13/06
主分类号
E21F13/06
代理机构
代理人
主权项
地址
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