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发明名称
Telephone signaling device
摘要
申请公布号
US2808463(A)
申请公布日期
1957.10.01
申请号
US19560589901
申请日期
1956.06.07
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
JENKINS REGINALD T.;POLK ROBERT E.
分类号
G10K1/062;G10K9/13;G10K11/02;H04M1/02;H04M19/04;H04Q5/08;H04R11/14
主分类号
G10K1/062
代理机构
代理人
主权项
地址
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