315 / | HD | ELECTRIC LAMP AND DISCHARGE DEVICES: SYSTEMS |
1 | DF | CATHODE RAY TUBE CIRCUITS {11} |
14 | .~ Plural concentrating, accelerating, and/or de-accelerating stages {2} | |
15 | DF | .~.~> Three or more stages {1} |
17 | DF | .~.~> With ray-deflecting stage interposed between plural concentrating or accelerating and/or de-accelerating stage or co-extensive with one such stage |