US PATENT SUBCLASS 340 / 307
.~.~ Transmitters

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}
307.~.~ Transmitters {2}
308  DF  .~.~.~> Controlled by door of signal box
309  DF  .~.~.~> With make and break wheel

DEFINITION

Classification: 340/307

(under subclass 287) Subject matter consisting of a transmitter utilized in signal box systems.

SEE OR SEARCH CLASS

341, Coded Data Generation or Conversion,

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