发明名称 SPIN DOWN
摘要 A toy comprising a airfoil launched from a sling shot type of launcher, the airfoil having a contour which will cause it to spin on its descent after having been projected into the air.
申请公布号 US3665641(A) 申请公布日期 1972.05.30
申请号 USD3665641 申请日期 1968.07.29
申请人 CLIFFORD W. HENDERSON 发明人 CLIFFORD W. HENDERSON
分类号 A63H27/14;(IPC1-7):A63H27/14 主分类号 A63H27/14
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