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发明名称
Bell ringing circuit and switch therefor
摘要
申请公布号
US2019075(A)
申请公布日期
1935.10.29
申请号
US19320603773
申请日期
1932.04.07
申请人
FARRELL BARTHOLOMEW T
发明人
FARRELL BARTHOLOMEW T.
分类号
G08B3/10
主分类号
G08B3/10
代理机构
代理人
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