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发明名称
Telephone system
摘要
申请公布号
US2023240(A)
申请公布日期
1935.12.03
申请号
US19340734747
申请日期
1934.07.12
申请人
ASSOCIATED ELECTRIC LABORATORIES, INC.
发明人
PETERSON EDWARD S.
分类号
H04M3/60;H04M7/10
主分类号
H04M3/60
代理机构
代理人
主权项
地址
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