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发明名称
Schaltungsanordnung fuer Fernsprechanlagen mit selbsttaetig anschaltbaren Sprechstromverstaerkern
摘要
申请公布号
DE683633(C)
申请公布日期
1939.11.10
申请号
DE1936S124317D
申请日期
1936.09.26
申请人
SIEMENS & HALSKE AKT.-GES.
发明人
PFLEIDERER DR.-ING. FRITZ
分类号
H04M3/40
主分类号
H04M3/40
代理机构
代理人
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