(under subclass 160) Subject matter wherein the envelope contains a gas or vapor.
(1) Note. This subclass includes discharge devices having a gas or vapor at a sufficient pressure to cause ionization of the gas or the electric discharge and devices wherein the claims state that the device contains a gas or vapor.
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567, and the subclass specified in the notes thereto for other devices under the class definition which are provided with an envelope and a gas or vapor atmosphere.
