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经营范围
发明名称
Circular slide rule
摘要
申请公布号
US1849058(A)
申请公布日期
1932.03.15
申请号
US19280273795
申请日期
1928.04.30
申请人
DEMPSTER JOHN R
发明人
DEMPSTER JOHN R.
分类号
G06G1/04
主分类号
G06G1/04
代理机构
代理人
主权项
地址
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