Mechanisms in the The Unofficial LEGO Technic Builder's Guide A) Power pulley B) Rack and pinion steering C) Scissors lift | Lego technic, Lego, Lego projects
What Will you Build? - The Unofficial LEGO Technic Builder's Guide, 2nd Edition [Book]
The Unofficial LEGO Technic Builder's Guide, 2nd Edition | No Starch Press