CPC Subgroup
H01J 23/04 Cathodes
Full Title
Details of transit-time tubes of the types covered by group H01J25/00 > Electrodes; Magnetic control means; Screens (associated with resonator or delay system H01J23/16) > Cathodes
1 direct subcode
Child Classifications
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- H01J 23/05 having a cylindrical emissive surface, e.g. cathodes for magnetrons