4. Electric lamp and discharge devices
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Field emission type electron gun

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

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Filament for X-ray tube and X-ray tube having the same

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

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Flat circular foil-filament lamp

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

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Fluorescent display device including a filamentary cathode with

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

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