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发明名称
Variable scale
摘要
申请公布号
US2156524(A)
申请公布日期
1939.05.02
申请号
US19370128180
申请日期
1937.02.27
申请人
CHRISTENSEN DAVID J
发明人
CHRISTENSEN DAVID J.
分类号
G01B3/04
主分类号
G01B3/04
代理机构
代理人
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