US PATENT SUBCLASS 340 / 293
.~.~ Variable signal (e.g., police and fire, first and third alarm)

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

286.01  DF  SYSTEMS {24}
287  DF  .~ Signal box type (e.g., to call messenger, plural fire alarm boxes) {11}
293.~.~ Variable signal (e.g., police and fire, first and third alarm) {1}
294  DF  .~.~.~> Dial selector for variable signal

DEFINITION

Classification: 340/293

(under subclass 287) Subject matter provided with means at the signal box for transmitting one or more of a variety of signals under the control of the operator.

SEE OR SEARCH CLASS

341, Coded Data Generation or Conversion,

20+, and 173+ for a pulse code transmitter..