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发明名称
Telephone ringer
摘要
申请公布号
US2269108(A)
申请公布日期
1942.01.06
申请号
US19390261698
申请日期
1939.03.14
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
HUBBELL JAMES D.;WIEBUSCH CHARLES F.
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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