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发明名称
Control device with two push buttons for two colours ball point pens
摘要
申请公布号
US3170440(A)
申请公布日期
1965.02.23
申请号
US19630274528
申请日期
1963.04.22
申请人
REAL PATENTAUSWERTUNGS ANSTALT
发明人
LEVOIN FRANCIS
分类号
B43K24/16
主分类号
B43K24/16
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