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发明名称
Announcing system
摘要
申请公布号
US2920147(A)
申请公布日期
1960.01.05
申请号
US19560572574
申请日期
1956.03.19
申请人
SELLERS JACK D;MATT RICHARD J
发明人
SELLERS JACK D.;MATT RICHARD J.
分类号
H04M3/487
主分类号
H04M3/487
代理机构
代理人
主权项
地址
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