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发明名称
Improvements in or relating to electric signalling apparatus for calling attendants
摘要
申请公布号
GB384768(A)
申请公布日期
1932.12.15
申请号
GB19310031529
申请日期
1931.11.13
申请人
EMILE LOUIS MONTAGUE VAN GELDER;THE PHOENIX TELEPHONE & ELECTRIC WORKS, LIMITED;LEONARD VICTOR MARKS
发明人
分类号
H04B5/00
主分类号
H04B5/00
代理机构
代理人
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地址
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