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发明名称
Measured service telephone system
摘要
申请公布号
US2217041(A)
申请公布日期
1940.10.08
申请号
US19380247618
申请日期
1938.12.24
申请人
ASSOCIATED ELECTRIC LABORATORIES, INC.
发明人
BOSWAU HANS P.
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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