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经营范围
发明名称
Signaling or dialing system
摘要
申请公布号
US2717280(A)
申请公布日期
1955.09.06
申请号
US19540413283
申请日期
1954.03.01
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
LOVELL CLARENCE A.
分类号
H04M1/50
主分类号
H04M1/50
代理机构
代理人
主权项
地址
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