4. Electric lamp and discharge devices
  5. Electrode and shield structures
  6. Filament or resistance heated electrodes
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Tantalum carbide or tantalum-alloy carbide filament mounting and

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

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Thermionic cathode heater

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

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Thermionic cathode heater having reduced magnetic field

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

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Thermionic emitter with balancing thermal conduction legs

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

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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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