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发明名称
Ten digit keyboard for calculating machine
摘要
申请公布号
US2727689(A)
申请公布日期
1955.12.20
申请号
US19530332159
申请日期
1953.01.21
申请人
BRUNSVIGA MASCHINENWERKE AKTIENGESELLSCHAFT
发明人
HEINDORFF HANS
分类号
G06C7/08
主分类号
G06C7/08
代理机构
代理人
主权项
地址
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