Patent US 3809899A

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Patent number US 3809899A (click link for details and documents via Google Patents)
Title Electron-beam tube including a thermionic-field emission cathode for a scanning electron microscope
Inventors T Baker, M Balsiger, K Considine, H Litsjo
Company Tektronix Inc
Filing date 1972-08-17
Grant date 1974-05-07



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