Assertion: cathode ray tube's electron gun | /r/HasAspect | heater
Facets:
Source sentences:
text: The electron gun has a heater, cathode, grid, pre-accelerating anode, focusing anode and accelerating anode.
text: The electron gun has a heater, cathode, pre-accelerating anode, focusing anode and accelerating anode.
text: The electron gun has a heater, cathode, pre-accelerating anode, focusing anode and accelerating anode.