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How Levers Help Us
1970-01-01 • 11m
Documentary
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.
1970-01-01 • 11m
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.
