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发明名称
Ratio scale
摘要
申请公布号
US2557944(A)
申请公布日期
1951.06.26
申请号
US19480043502
申请日期
1948.08.10
申请人
CROOK DAVID K
发明人
CROOK DAVID K.
分类号
B43L7/00;B43L13/00
主分类号
B43L7/00
代理机构
代理人
主权项
地址
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