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发明名称
Call board
摘要
申请公布号
US2677347(A)
申请公布日期
1954.05.04
申请号
US19530338536
申请日期
1953.02.24
申请人
BUMP ZENAS A
发明人
BUMP ZENAS A.
分类号
G09D1/00
主分类号
G09D1/00
代理机构
代理人
主权项
地址
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