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发明名称
Telephone system
摘要
申请公布号
US1869007(A)
申请公布日期
1932.07.26
申请号
US19300421980
申请日期
1930.01.20
申请人
ASSOCIATED ELECTRIC LABORATORIES, INC.
发明人
CROCKER THOMAS F.
分类号
H04M3/60
主分类号
H04M3/60
代理机构
代理人
主权项
地址
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