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Tiny rubik’s cube goes on sale in japan to mark 40th anniversary .
Tiny Rubik’s Cube goes on sale in Japan to mark 40th anniversary
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Jan. 30, 1975: Rubik Applies for Patent on Magic Cube | WIRED
How Many Types of Rubik's Cube are Available? - GoCube
Rubik’s Cube Inventor Erno Rubik on His New Book, ‘Cubed’