How Levers Help Us (1970)
This instructional film shows the three parts of a lever and demonstrates how various levers help to move things more easily, or move them farther and faster.
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How Levers Help Us
1970 / 0 hr 11 minThis instructional film shows the three parts of a lever and demonstrates how various levers help to move things more easily, or move them farther and faster.
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Coronet Instructional Films
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