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发明名称
Improvement in the construction of slide-rules
摘要
申请公布号
GB356434(A)
申请公布日期
1931.09.10
申请号
GB19300024549
申请日期
1930.08.16
申请人
SYDNEY HERBERT STELFOX
发明人
分类号
B43L7/00
主分类号
B43L7/00
代理机构
代理人
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