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Simple machine projects
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- juvenile literature (6)
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- axles (2)
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- levers (2)
- pulleys (2)
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- children's nonfiction (1)
- crafts & hobbies / jewelry (1)
- jewelry making (1)
- juvenile works (1)
- machine sewing (1)
- science projects (1)
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- solder and soldering (1)
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