phototube
preferred label: لامپ فوتونی @fa
type: Concept
broader: cold-cathode tube

positive column
preferred label: ستون مثبت @fa
type: Concept
related: cold-cathode tube

electron tube
preferred label: لامپ الکترونی @fa
type: Concept
narrower: cold-cathode tube

cold-cathode tube
alternative label: dekatrons
narrower: phototube
related: positive column
broader: electron tube
preferred label: لامپ کاتد-سرد @fa
type: Concept