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经营范围
发明名称
Improvements in electric signalling or indicating instruments
摘要
申请公布号
GB383672(A)
申请公布日期
1932.11.24
申请号
GB19310024097
申请日期
1931.08.27
申请人
HOPKINSONS LIMITED;ROBERT ADDY HOPKINSON;WILLIAM BOURNE DALE
发明人
分类号
E21F17/18
主分类号
E21F17/18
代理机构
代理人
主权项
地址
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