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发明名称
Slide rule
摘要
申请公布号
US1934232(A)
申请公布日期
1933.11.07
申请号
US19320592275
申请日期
1932.02.11
申请人
KEUFFEL & ESSER CO.
发明人
KEUFFEL ADOLF W.
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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