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发明名称
Device for differentiating and indicating the relative occurrences of a sequence of events
摘要
申请公布号
US2206827(A)
申请公布日期
1940.07.02
申请号
US19360060852
申请日期
1936.01.25
申请人
PRINCE JR LEON M
发明人
JR. LEON M. PRINCE,
分类号
A63B69/12;A63B71/06
主分类号
A63B69/12
代理机构
代理人
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