US PATENT SUBCLASS 246 / 30
.~.~.~.~ Hertzian wave


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}
30.~.~.~.~ Hertzian wave


DEFINITION

Classification: 246/30

(under subclass 29) Systems in which the signals or automatic-stop devices are actuated or controlled by the methods of so-called "wireless telegraphy", making use of Hertzian waves.

SEE OR SEARCH CLASS

340, Communications: Electrical,

825.69, and 825.72 for radio-wave systems for controlling a device.

342, Communications: Directive Radio Wave Systems and Devices (e.g., Radar, Radio Navigation), appropriate subclasses for miscellaneous radio-signaling and teledynamic systems, particularly

61+, for the miscellaneous systems for controlling a device by means of reflected or otherwise returned radio wave energy; See the classes under "SEARCH CLASS" in the class definitions of Class 343 for the other classes which provide for radiant-energy systems for controlling a device.