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发明名称
Telephone substation
摘要
申请公布号
US2214212(A)
申请公布日期
1940.09.10
申请号
US19380195812
申请日期
1938.03.14
申请人
ASSOCIATED ELECTRIC LABORATORIES, INC.
发明人
VOSS JOHN HENRY
分类号
H04M1/58;H04M1/60
主分类号
H04M1/58
代理机构
代理人
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地址
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