Keywords: Patent issue -1329559 Tesla Sign.png en An excerpt from US patent issue 1329559 Sign 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 versions PD-old-70-1923 Uploaded with UploadWizard Nikola Tesla |