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发明名称
Rechenhilfsmittel
摘要
申请公布号
DE902192(C)
申请公布日期
1954.01.21
申请号
DE1949P055852
申请日期
1949.09.24
申请人
FRIEDRICH ZWERNEMANN
发明人
ZWERNEMANN FRIEDRICH
分类号
G06G1/14
主分类号
G06G1/14
代理机构
代理人
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