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发明名称
Helical runway ball game
摘要
申请公布号
US2664291(A)
申请公布日期
1953.12.29
申请号
US19500188740
申请日期
1950.10.06
申请人
PETTERSON HAROLD F
发明人
PETTERSON HAROLD F.
分类号
A63F7/02
主分类号
A63F7/02
代理机构
代理人
主权项
地址
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