LEGO Great Ball Contraption: FiveTilted Rings - YouTube
The LEGO Power Functions Idea Book, Volume 2: Cars and Contraptions : Isogawa, Yoshihito: Amazon.es: Libros
Lego Crazy Action de segunda mano por 20 EUR en León en WALLAPOP
This is one of the Lego Crazy Action Contraptions' projects. A mechanical claw that kids can use to grab various objects (and practice those coordination skills…
Lego Crazy Action Contraptions (Klutz) : Rathjen, Don: Amazon.es: Libros
Lego: Crazy Action Contraptions : Stillinger, Doug: Amazon.es: Libros
LEGO Crazy Action Contraptions Set & Klutz Instructional Book (16 Projects) | eBay