IPIQ

H

ELECTRICITY

H01

ELECTRIC ELEMENTS

H01J

ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS

2203/00

Electron or ion optical arrangements common to discharge tubes or lamps

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H01J2203/02

Electron guns

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H01J2203/0204

using cold cathodes, e.g. field emission cathodes

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H01J2203/0208

Control electrodes

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H01J2203/024

Focusing electrodes

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