US PATENT SUBCLASS 246 / 88
.~.~.~.~ Intermediate signal

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}
87  DF  .~.~.~ Line-current supply {4}
88.~.~.~.~ Intermediate signal

DEFINITION

Classification: 246/88

(under subclass 87) Systems in which a plurality of signals, usually electric lamps, are displayed within the block.

SEE OR SEARCH THIS CLASS, SUBCLASS:

246+, and the subclasses mentioned in the search notes appended thereto, for various types of circuit-controllers.