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发明名称
Electric ringer
摘要
申请公布号
US2424550(A)
申请公布日期
1947.07.29
申请号
US19430475688
申请日期
1943.02.12
申请人
INTERNATIONAL STANDARD ELECTRIC CORPORATION
发明人
BRACKE OSCAR J. J.
分类号
G10K1/062
主分类号
G10K1/062
代理机构
代理人
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地址
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