4. Electric lamp and discharge devices
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Alkaline earth metal oxide cathode containing rare earth metal o

Electric lamp and discharge devices – Electrode and shield structures – Cathodes containing and/or coated with electron emissive...
Patent

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Apparatus for an electron gun employing a thermionic...

Electric lamp and discharge devices – Electrode and shield structures – Cathodes containing and/or coated with electron emissive...
Reexamination Certificate

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