CPC Subgroup Additional Only
H01J 2231/12 CRTs having luminescent screens
Full Title
Cathode ray tubes or electron beam tubes (H01J2329/00 takes precedence) > CRTs having luminescent screens
2 direct subcodes
Child Classifications
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- H01J 2231/121 Means for indicating the position of the beam, e.g. beam indexing
- H01J 2231/125 with a plurality of electron guns within the tube envelope