(under subclass 150) Device having a closed usually glass container under vacuum or containing a specific gas used for producing, influencing, or using a flow of electrons or ions to generate light or other electromagnetic radiation.
SEE OR SEARCH CLASS
315, Electric Lamp and Discharge Devices: Systems.
328, Miscellaneous Electron Space Discharge Device Systems.
330, Amplifiers, for crossed field amplifier.
331, Oscillators, particularly
107, for oscillators containing low temperature superconducting material.
