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发明名称
Selective program service system
摘要
申请公布号
US1812169(A)
申请公布日期
1931.06.30
申请号
US19290341091
申请日期
1929.02.19
申请人
STROMBERG-CARLSON TELEPHONE MANUFACTURING COMPANY
发明人
POWELL WINFRED T.
分类号
H04H20/83
主分类号
H04H20/83
代理机构
代理人
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地址
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