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发明名称
Electric signaling
摘要
申请公布号
US2344612(A)
申请公布日期
1944.03.21
申请号
US19420448735
申请日期
1942.06.27
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
HARTLEY RALPH V. L.
分类号
H04M3/64;H04M15/08
主分类号
H04M3/64
代理机构
代理人
主权项
地址
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