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Rock-a-Stack : ウィキペディア英語版 | Rock-a-Stack Rock-a-Stack is a toy by Fisher-Price with colorful rings that have to be placed in order of size onto a pole. It is designed to teach young children about colors and to help them develop their eye and hand coordination. Since the introduction of Rock-A-Stacks in 1960, over 40 million have been sold. ==External links==
*(Fisher-Price's site ) *(Training a dog to use it )
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Rock-a-Stack」の詳細全文を読む
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