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soluble oilgreaseneat’s-foot oilgear oilsolid lubricationfluid-film lubricationboundary lubricationsynthetic lubricantlubricating oillard oilwearfrictionparticle acceleratorclockrobotoscilloscopesimple machinebalancesundialdrilling machinery
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Elijah McCoy
American inventor

Osborne Reynolds
British engineer and physicist