Patent US 4563652A: Revision history

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14 February 2022

  • curprev 00:5400:54, 14 February 2022‎ Peter talk contribs‎ 174 bytes +174‎ Created page with "{{Patent |Office=US |Number=4563652A |Title=Dual-stage filter with feedback |Company=Audio Precision |Inventors=Bruce Hofer |Filing date=1985-04-12 |Grant date=1986-01-07 }}"
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