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发明名称
Improvements in electrical signalling apparatus
摘要
申请公布号
GB378104(A)
申请公布日期
1932.08.11
申请号
GB19310013888
申请日期
1931.05.11
申请人
THE GENERAL ELECTRIC COMPANY LIMITED;RONALD CLAUDE WALKER
发明人
分类号
G01P13/04
主分类号
G01P13/04
代理机构
代理人
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地址
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