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• 05:18, 8 September 2021 Peter talk contribs created page Patent US 3350640A (Created page with "{{Patent |Office=US |Number=3350640A |Title=Electron diffraction voltmeter |Company=Gertrude F Rempfer |Inventors=Gertrude F Rempfer |Filing date=1963-12-23 |Grant date=1967-1...")