Patent classifications
H
ELECTRICITY
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H01
ELECTRIC ELEMENTS
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H01J
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
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19/00
Details of vacuum tubes of the types covered by group H01J21/00
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H01J19/02
Electron-emitting electrodes; Cathodes
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H01J19/14
Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
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