US PATENT SUBCLASS 246 / 29 A
.~.~.~.~ Electronic gaseous ionization devices

Current as of: June, 1999
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246 /   HD   RAILWAY SWITCHES AND SIGNALS

20  DF  BLOCK-SIGNAL SYSTEMS {4}
27  DF  .~ Automatic {5}
28 R  DF  .~.~ Electric {18}
29 R  DF  .~.~.~ Radiant energy {2}
29 A.~.~.~.~ Electronic gaseous ionization devices

Unofficial Alpha Subclasses: R A

DEFINITION

Classification: 246/29

(under subclass 28) Systems in which the traffic- control devices are actuated and controlled by waves of radiant energy as heat, light, etc.

SEE OR SEARCH CLASS

359, Optics: Systems (Including Communication) and Elements,

109+, for signalling systems in which intelligence is transmitted over a light or analogous beam.

455, Telecommunications,

200.1+, and the classes and subclasses specified in the Notes thereto for photocell-controlled electric circuits and photocell apparatus.