BE419762A - - Google Patents

Info

Publication number

BE419762A

BE419762A BE419762DA BE419762A BE 419762 A BE419762 A BE 419762A BE 419762D A BE419762D A BE 419762DA BE 419762 A BE419762 A BE 419762A

Authority

BE

Belgium

Prior art keywords

electrodes

cathode

shadow

grid

tube according

Prior art date

Links

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