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发明名称
Ventilation system for mines
摘要
申请公布号
US2729066(A)
申请公布日期
1956.01.03
申请号
US19530375615
申请日期
1953.08.21
申请人
KENNEDY JACK R;KENNEDY SAMUEL F
发明人
KENNEDY JACK R.;KENNEDY SAMUEL F.
分类号
E21F1/14
主分类号
E21F1/14
代理机构
代理人
主权项
地址
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