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发明名称
Telephone system
摘要
申请公布号
US1889229(A)
申请公布日期
1932.11.29
申请号
US19310510680
申请日期
1931.01.23
申请人
ASSOCIATED ELECTRIC LABORATORIES, INC.
发明人
THARP VICTOR S.
分类号
H04Q3/00
主分类号
H04Q3/00
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代理人
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