Patent US 2280531A: Revision history

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13 March 2022

  • curprev 08:1908:19, 13 March 2022‎ Peter talk contribs‎ 213 bytes +213‎ Created page with "{{Patent |Office=US |Number=2280531A |Title=Oscillograph apparatus |Company=General Electric |Inventors=Donald E Norgaard |Filing date=1940-11-01 |Grant date=1942-04-21 }} Ve..."
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