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发明名称
Device for counting persons ascending and descending a flight of steps
摘要
申请公布号
US2494401(A)
申请公布日期
1950.01.10
申请号
US19460693505
申请日期
1946.08.28
申请人
ANDRE MEURIOT PAUL
发明人
MEURIOT PAUL ANDRE
分类号
G06M3/14
主分类号
G06M3/14
代理机构
代理人
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