US PATENT SUBCLASS 246 / 128
.~ Normally open track circuit
Current as of:
June, 1999
Click
HD
for Main Headings
Click for
All Classes
Internet Version by
PATENTEC
© 1999
     
Terms of Use
246 /
HD
RAILWAY SWITCHES AND SIGNALS
125
DF
ELECTRIC AUTOMATIC HIGHWAY SIGNALS, MINE DOORS, AND GATES
{3}
128
.~ Normally open track circuit {1}
129
DF
.~.~
> Short sectional rail closure
DEFINITION
Classification: 246/128
(under subclass 125) Subject matter where the primary or controlling track-circuit is normally open.
SEE OR SEARCH THIS CLASS, SUBCLASS:
58+, for systems of open-track-circuit control.
111, 125, 260, 293, and 473, and appropriate indented subclasses, for signal structure.