(under subclass 518) Subject matter wherein the controlling means includes an electronic tube into which a small amount of gas or vapor is introduced after the tube has been evacuated.
SEE OR SEARCH THIS CLASS, SUBCLASS:
601+, for miscellaneous circuits having gas tubes of particular structure.
SEE OR SEARCH CLASS
315, Electric Lamp and Discharge Devices: Systems, appropriate subclasses for system wherein a gaseous space discharge tube is the ultimate load or controls a space discharge load.
