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发明名称
Telephone signaling system
摘要
申请公布号
US2197966(A)
申请公布日期
1940.04.23
申请号
US19380183603
申请日期
1938.01.06
申请人
ASSOCIATED ELECTRIC LABORATORIES, INC.
发明人
COX IRVIN W.
分类号
H04M1/70;H04M1/723
主分类号
H04M1/70
代理机构
代理人
主权项
地址
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