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经营范围
发明名称
Telephone signal transmitter
摘要
申请公布号
US2508526(A)
申请公布日期
1950.05.23
申请号
US19470789881
申请日期
1947.12.05
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
MARRISON WARREN A.
分类号
H04M1/272
主分类号
H04M1/272
代理机构
代理人
主权项
地址
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