Up, down, or open-moving machines View on Open Library

Up, down, or open-moving machines

by Michele Spirn

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First published: 2006 1 language ISBN: 9780021928385
Description
Discusses how simple machines work using drawbridges, escalators, and retractable roofs as examples.
Subjects
Simple machines Juvenile literature Machine design History Readers (Elementary) Readers (Primary) Machines simples Ouvrages pour la jeunesse Machines Conception et construction

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