4. Electric lamp and discharge devices
  5. Electrode and shield structures
  6. Filament or resistance heated electrodes
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Thermionic ionization source

Electric lamp and discharge devices – Electrode and shield structures – Filament or resistance heated electrodes
Patent

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Triple-coil incandescent filament

Electric lamp and discharge devices – Electrode and shield structures – Filament or resistance heated electrodes
Patent

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Vacuum electron device having directly-heated matrix-cathode-hea

Electric lamp and discharge devices – Electrode and shield structures – Filament or resistance heated electrodes
Patent

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Wire mesh cathode

Electric lamp and discharge devices – Electrode and shield structures – Filament or resistance heated electrodes
Patent

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Wire shaped electron source

Electric lamp and discharge devices – Electrode and shield structures – Filament or resistance heated electrodes
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