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发明名称
Alternating current signalling system
摘要
申请公布号
GB432759(A)
申请公布日期
1935.08.01
申请号
GB19340016113
申请日期
1934.05.30
申请人
SIEMENS & HALSKE AKTIENGESELLSCHAFT
发明人
分类号
H03F13/00
主分类号
H03F13/00
代理机构
代理人
主权项
地址
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