Patent GB 460562A: Revision history

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13 March 2022

  • curprev 07:5007:50, 13 March 2022‎ Peter talk contribs‎ 237 bytes +237‎ Created page with "{{Patent |Office=GB |Number=460562A |Title=Improvements In and Relating to Thermionic Valve Circuits |Company= |Inventors=W.S.Percival |Filing date=1935-07-24 |Grant date=1937..."
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