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发明名称
Numerals balance scale
摘要
申请公布号
US3311997(A)
申请公布日期
1967.04.04
申请号
US19650423473
申请日期
1965.01.05
申请人
KUSAN, INC.
发明人
DENNY CARL B.
分类号
G09B19/02
主分类号
G09B19/02
代理机构
代理人
主权项
地址
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