(under the class definition) Subject matter wherein the amplifying device is of the vacuum tube type including means for generating an electron stream or beam, and having additional means therein for propagating an electromagnetic wave or component thereof at a velocity reduced from the free space velocity of the wave and propagated in proximity of the electron stream or beam, permitting exchange of energy between the electrons and the electromagnetic wave.
SEE OR SEARCH THIS CLASS, SUBCLASS:
5, for amplifiers having a solid element wave propagating amplifying device.
SEE OR SEARCH CLASS
315, Electric Lamp and Discharge Devices, Systems,
3.5+, and 39.3 for traveling wave type tubes involved as the
load device in miscellaneous circuits. See the search notes under subclasses 3.5 and 39.3. 331, Oscillators,
