1.) New lego polarity switch:

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Building robots with Lego Mindstorms: the ultimate tool for ... - Google Books Result -  Lego R/C Tank Test. Well - I finally got around to testing the idea of a tank built ... The polarity switch is supplied from a battery box and the output is ... 

LEGO Mindstorms masterpieces: building and programming advanced robots - Google Books Result -  LEGO 5120 - TWO Polarity Switch - Electric Technic - NR ... automatically reverse motor direction or act as a limit switch. Used but in like-new condition . ... 

Building robots with Lego Mindstorms NXT - Google Books Result -  

here is a new "lego perpetuum mobile" done from lego and some permanent magnets ... just listen for the click of the switch as the camera moves off ... and rotor magnets are facing and approaching the same polarity, ... 

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