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经营范围
发明名称
Control of doors or gates for mining and other purposes
摘要
申请公布号
US1778661(A)
申请公布日期
1930.10.14
申请号
US19270225106
申请日期
1927.10.10
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
CHILDE LESLIE B.;KERSHAW ARTHUR G.
分类号
E21F1/10
主分类号
E21F1/10
代理机构
代理人
主权项
地址
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