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经营范围
发明名称
Telephone transmission system and apparatus therefor
摘要
申请公布号
US2390869(A)
申请公布日期
1945.12.11
申请号
US19420460520
申请日期
1942.10.02
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
JR. CHARLES W. CARTER,
分类号
H04J1/16
主分类号
H04J1/16
代理机构
代理人
主权项
地址
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