Patent US 2280524A: Revision history

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13 March 2022

  • curprev 07:2007:20, 13 March 2022Peter talk contribs 269 bytes +269 Created page with "{{Patent |Office=US |Number=2280524A |Title=Electrical wave analysis |Company=General Electric |Inventors=Siegfried Hansen |Filing date=1940-11-01 |Grant date=1942-04-21 }} V..."