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2009., Juvenile, Crabtree Pub. Company Call No: 621.8 Availability:1 of 1 At Location(s) Series Title: Get to know simple machines.Summary Note: 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.