US PATENT SUBCLASS 332 / 171
.~.~ Including electron discharge device

Current as of: June, 1999
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332 /   HD   MODULATORS

149  DF  AMPLITUDE MODULATOR {14}
170  DF  .~ Single or vestigial sideband type {1}
171.~.~ Including electron discharge device

DEFINITION

Classification: 332/171

Including electron discharge device:

(under subclass 170) Subject matter utilizing a device which has electrical current flow between two spaced electrodes in a gas, vapor or vacuum.

(1) Note. This might include, for example, vacuum or gas tubes such as diodes, triodes or pentodes.

(2) Note. Additional control electrodes may be present.