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Publication of NL87649CpublicationCriticalpatent/NL87649C/xx
H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
H01J29/84—Traps for removing or diverting unwanted particles, e.g. negative ions, fringing electrons; Arrangements for velocity or mass selection
H01J29/845—Traps for removing or diverting unwanted particles, e.g. negative ions, fringing electrons; Arrangements for velocity or mass selection by means of magnetic systems