US PATENT SUBCLASS 246 / 104
.~ Manual
Current as of:
June, 1999
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246 /
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RAILWAY SWITCHES AND SIGNALS
20
DF
BLOCK-SIGNAL SYSTEMS
{4}
104
.~ Manual {1}
105
DF
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> Electric {1}
DEFINITION
Classification: 246/104
(under subclass 20) Subject matter having traffic-controlling devices actuated either by manual power or by manually-controlled power mechanism.
(1) Note. So-called "manual-block systems" are here included.
SEE OR SEARCH THIS CLASS, SUBCLASS:
21, and appropriate indented subclasses, for systems of manual actuation in combination with automatic signals.
112, and 117, for manual systems at grade-crossing.
118, and 119, for manual systems at draw-bridges.
143, through 158, for manual systems of interlocking.
