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发明名称
Measured service telephone system
摘要
申请公布号
US1909025(A)
申请公布日期
1933.05.16
申请号
US19310509330
申请日期
1931.01.17
申请人
ASSOCIATED ELECTRIC LABORATORIES, INC.
发明人
THARP VICTOR S.
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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