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IPC Subgroup
H01J 40/1

Selection of substances for gas fillings

Introduced: January 1980

Last revised: January 2006

Full Title

Photoelectric discharge tubes not involving the ionisation of a gas > Details > Selection of substances for gas fillings

Classification Context

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