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发明名称
Magnet racing device
摘要
申请公布号
US2721742(A)
申请公布日期
1955.10.25
申请号
US19530340692
申请日期
1953.03.06
申请人
LEONARD WHITLOCK JOHN
发明人
WHITLOCK JOHN LEONARD
分类号
A63H18/10
主分类号
A63H18/10
代理机构
代理人
主权项
地址
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