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Pulleys

by Manolis, Kay

$21.53

List Price: $26.95
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Description

Pulleys are simple machines used to lift and move loads. Builders use pulley systems to lift tools or materials. Elevators use pulleys to move up and down. Kids will learn how pulleys make work easier and how they are often part of complex machines.

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Product Details

  • Aug 1, 2009 Pub Date:
  • 1600143245 ISBN-10:
  • 9781600143243 ISBN-13:
  • English Language