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Pressing Down: The Lever (Robotx Get Help from Simple Machines)
Gerry Bailey
Library Binding. Crabtree Publishing Company 2014-02-28.
ISBN 9780778704164
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Publisher description
Pressing Down explores the benefits and uses of the lever. RobbO and RobbEE learn how a lever can be formed in three different ways to do different kinds of worklift and lower, separate, and open
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Pressing Down: The Lever
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