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发明名称
Telephone system
摘要
申请公布号
US2258660(A)
申请公布日期
1941.10.14
申请号
US19400329087
申请日期
1940.04.11
申请人
ASSOCIATED ELECTRIC LABORATORIES, INC.
发明人
PETERSON SETH E.;GRIFFINS MORRIS E.
分类号
H04M3/52
主分类号
H04M3/52
代理机构
代理人
主权项
地址
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