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发明名称
SUBTRACTING CONTROL FOR CALCULATING MACHINES
摘要
申请公布号
CA310399(A)
申请公布日期
1931.04.14
申请号
CAD310399
申请日期
申请人
THE ELLIS ADDING TYPEWRITER COMPANY
发明人
NATHAN W. PERKINS
分类号
主分类号
代理机构
代理人
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