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发明名称
Telephone system
摘要
申请公布号
US2122490(A)
申请公布日期
1938.07.05
申请号
US19360114102
申请日期
1936.12.04
申请人
SIEMENS & HALSKE AKTIENGESELLSCHAFT
发明人
PINELL WALTER
分类号
H04M3/58
主分类号
H04M3/58
代理机构
代理人
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