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发明名称
Telephone system
摘要
申请公布号
US1990437(A)
申请公布日期
1935.02.05
申请号
US19330687870
申请日期
1933.09.01
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
MOODY DWIGHT L.;NEWBY NEAL D.
分类号
H04M3/60
主分类号
H04M3/60
代理机构
代理人
主权项
地址
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