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发明名称
Telephone system
摘要
申请公布号
US2269375(A)
申请公布日期
1942.01.06
申请号
US19390289674
申请日期
1939.08.11
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY;BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
MCCOWN RAY B.;SCHNECKLOTH HARRY HOWARD;SMITH ROBERT WILLIAM
分类号
H04M17/02
主分类号
H04M17/02
代理机构
代理人
主权项
地址
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