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发明名称
Telephone ringer
摘要
申请公布号
US2590500(A)
申请公布日期
1952.03.25
申请号
US19490086518
申请日期
1949.04.09
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
BREDEHOFT HAROLD A.;RICHARDSON MAX S.
分类号
G10K1/062
主分类号
G10K1/062
代理机构
代理人
主权项
地址
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