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发明名称
Call-holder and dial-through plug for cord-operated switchboards
摘要
申请公布号
US2984702(A)
申请公布日期
1961.05.16
申请号
US19580716965
申请日期
1958.02.24
申请人
SEMON LAWRENCE J
发明人
SEMON LAWRENCE J.
分类号
H04M9/00
主分类号
H04M9/00
代理机构
代理人
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地址
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