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发明名称
Telephone system
摘要
申请公布号
US2157848(A)
申请公布日期
1939.05.09
申请号
US19360117837
申请日期
1936.12.28
申请人
ASSOCIATED ELECTRIC LABORATORIES, INC.
发明人
CROCKER THOMAS F.
分类号
H04Q3/58
主分类号
H04Q3/58
代理机构
代理人
主权项
地址
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