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发明名称
Indicating board
摘要
申请公布号
US2145984(A)
申请公布日期
1939.02.07
申请号
US19380220788
申请日期
1938.07.22
申请人
KNUTSON CARL M
发明人
KNUTSON CARL M.
分类号
G09F7/20;G09F11/23
主分类号
G09F7/20
代理机构
代理人
主权项
地址
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