CPC Subgroup
H01J 40/10 Selection of substances for gas fillings
Full Title
Photoelectric discharge tubes not involving the ionisation of a gas (H01J49/00 takes precedence) > Details > Selection of substances for gas fillings
H01J 40/10 Photoelectric discharge tubes not involving the ionisation of a gas (H01J49/00 takes precedence) > Details > Selection of substances for gas fillings