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发明名称
Improvements in band calculators
摘要
申请公布号
GB1010461(A)
申请公布日期
1965.11.17
申请号
GB19610002406
申请日期
1961.01.20
申请人
ROLLER RULES LIMITED
发明人
NORTON RICHARD BOYD
分类号
G06G1/02
主分类号
G06G1/02
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