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发明名称
Slide rule
摘要
申请公布号
US2061853(A)
申请公布日期
1936.11.24
申请号
US19340754115
申请日期
1934.11.21
申请人
SHAEFFER GEORGE D
发明人
SHAEFFER GEORGE D.
分类号
G06G1/06
主分类号
G06G1/06
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