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IPC Subgroup
H01J 17/2

Selection of substances for gas fillings; Specified operating pressures or temperatures

Introduced: September 1968

Last revised: January 2012

Full Title

Gas-filled discharge tubes with solid cathodes > Details > Selection of substances for gas fillings; Specified operating pressures or temperatures

Classification Context

Section:
ELECTRICITY
Class:
ELECTRIC ELEMENTS
Subclass:
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS