US PATENT SUBCLASS 246 / 223
.~.~ Three-position signals
Current as of:
June, 1999
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246 /
HD
RAILWAY SWITCHES AND SIGNALS
218
DF
ELECTRIC ACTUATION
{9}
221
DF
.~ Motor systems {5}
223
.~.~ Three-position signals
DEFINITION
Classification: 246/223
(under subclass 221) Subject matter especially adapted for actuating three-position signals.
SEE OR SEARCH THIS CLASS, SUBCLASS:
38, 44 and 45, for so-called "wireless" controls" in block-signaling systems.
39, and 46+, for line-wire control in block signaling systems.
53, for details of three-position-signal actuation in block signaling systems.
60, for general schemes of three-position-signal control.
224, for motor means for actuating home and distant signals upon the same mast. 479+, for the structure of semaphores.
