How Levers Help Us
1970·0h 11m·Released
0.0
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.
0.0
Rating
0h 11m
Runtime
1970·0h 11m·Released
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.
0.0
Rating
0h 11m
Runtime
