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• 18:47, 12 April 2021 Apm (Talk | contribs) uploaded File:Differential-gear-with-wedge-cut-open.gif (= Drexler-Merkle Differential Gear = '''Description:''' <br> This is the Drexler-Merkle Differential Gear. It was modeled and simulated entirely using NanoEngineer-1. This molecular differential gear was designed by K. Eric Drexler and Ralph Merkle s...)