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=== Links == | === Links == | ||
==== Levers ==== | ==== Levers ==== | ||
* [https://www.youtube.com/watch?v= | * [https://www.youtube.com/watch?v=YlYEi0PgG1g How Levers work] | ||
==== Linkages ==== | ==== Linkages ==== | ||
* [http://www.ams.org/samplings/feature-column/fcarc-linkages1 Mathematics of Linkages] | * [http://www.ams.org/samplings/feature-column/fcarc-linkages1 Mathematics of Linkages] | ||