US PATENT SUBCLASS 246 / 437
.~.~ Renewable and reenforced
Current as of:
June, 1999
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246 /
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RAILWAY SWITCHES AND SIGNALS
415 R
DF
SWITCHES
{21}
435 R
DF
.~ Point {8}
437
.~.~ Renewable and reenforced
DEFINITION
Classification: 246/437
(under subclass 435) Subject matter having a point switch which has renewable or reinforced points.