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发明名称
Telephone system
摘要
申请公布号
US1889107(A)
申请公布日期
1932.11.29
申请号
US19300465901
申请日期
1930.07.07
申请人
ASSOCIATED ELECTRIC LABORATORIES, INC.
发明人
PETERSON EDWARD S.
分类号
E04H6/34;H04Q3/42
主分类号
E04H6/34
代理机构
代理人
主权项
地址
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