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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41/00
Discharge tubes for measuring pressure of introduced gas; or for detecting presence of gas; Discharge tubes for evacuation by diffusion of ions
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H01J41/12
Discharge tubes for evacuating by diffusion of ions, e.g. ion pumps, getter ion pumps
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H01J41/18
with ionisation by means of cold cathodes
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H01J41/20
using gettering substances
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