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发明名称
Telephone system
摘要
申请公布号
US2105001(A)
申请公布日期
1938.01.11
申请号
US19350047786
申请日期
1935.11.01
申请人
SIEMENS & HALSKE AKTIENGESELLSCHAFT
发明人
MICHAELIS WALTER
分类号
H04Q3/62
主分类号
H04Q3/62
代理机构
代理人
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