Get to know screws by Paul C Challen

Get to know screws

Paul C Challen
Crabtree Pub. Company
Jan 2009
 Book : Juvenile audience : EnglishView all editions and formats
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All people have jobs to do. Some jobs take a lot of energy. Simple machines help people get jobs done without working too hard. There are six kinds of simple machines: inclined planes, levers, pulleys, wedges, screws, and wheels and axles.
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About this book
Publisher Crabtree Pub. Compa...
Published 2009
Readers 0