US PATENT SUBCLASS 246 / 7
.~ Train telegraphy or telephony

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

2 R  DF  TRAIN DISPATCHING {7}
7.~ Train telegraphy or telephony {3}
8  DF  .~.~> Inductive
9  DF  .~.~> Continuous contacts {2}
13  DF  .~.~> Emergency signal stations

DEFINITION

Classification: 246/7

(under subclass 2) Teles:graphic or telephonic systems specially adapted for communication between trains and the dispatcher or other stations.

SEE OR SEARCH THIS CLASS, SUBCLASS:

167+, and all subclasses mentioned in the search notes appended thereto, for cab- signal systems giving only one or a limited number of indications.

SEE OR SEARCH CLASS

375, Pulse or Digital Communications, for miscellaneous pulse communications.

455, Telecommunications,

500+, for miscellaneous analog modulated carrier wave communications.