CPC Subgroup
H01J 19/22 Dispenser-type cathodes, e.g. L-cathode
Full Title
Details of vacuum tubes of the types covered by group H01J21/00 > Electron-emitting electrodes; Cathodes > Thermionic cathodes > Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment > Dispenser-type cathodes, e.g. L-cathode