4. Electric lamp and discharge devices
  5. Electrode and shield structures
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Heater coil for electron tube

Electric lamp and discharge devices – Electrode and shield structures – Indirectly heated cathodes
Patent

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Heater for an indirectly heated cathode

Electric lamp and discharge devices – Electrode and shield structures – Indirectly heated cathodes
Patent

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Heater for indirectly-heated cathode

Electric lamp and discharge devices – Electrode and shield structures – Indirectly heated cathodes
Patent

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