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发明名称
Telephone system
摘要
申请公布号
US2211443(A)
申请公布日期
1940.08.13
申请号
US19380235719
申请日期
1938.10.19
申请人
ASSOCIATED TELEPHONE AND TELEGRAPH COMPANY
发明人
STEHLIK RUDOLPH FRANK
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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