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发明名称
Signaling system
摘要
申请公布号
US2250100(A)
申请公布日期
1941.07.22
申请号
US19390304309
申请日期
1939.11.14
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
HUBBARD FRANCIS A.
分类号
H04M1/50;H04Q3/42
主分类号
H04M1/50
代理机构
代理人
主权项
地址
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