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发明名称
Telephone system
摘要
申请公布号
US2221652(A)
申请公布日期
1940.11.12
申请号
US19370168836
申请日期
1937.10.13
申请人
SIEMENS & HALSKE AKTIENGESELLSCHAFT
发明人
PFLEIDERER FRITZ;SEIFFERT BERNHARD
分类号
H03G11/00;H04M1/60;H04M9/08
主分类号
H03G11/00
代理机构
代理人
主权项
地址
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