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Keywords: Patent issue -1329559 Fig4.png en An excerpt from US patent issue 1329559 Fig 4 1920-02-03 http //www google com/patents id Lt1PAAAAEBAJ printsec abstract zoom 4 source gbs_overview_r cad 0 v onepage q f false Nikola Tesla died 1943 Other figures from same page <gallery showfilename> Tesla_valve_cross-section png Patent issue -1329559 Fig2 png Patent issue -1329559 Fig3 png</gallery> PD-old-70-1923 Uploaded with UploadWizard Patents by Nikola Tesla |