US PATENT SUBCLASS 238 / 194
.~.~.~.~ Longitudinal keys
Current as of:
June, 1999
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238 /
HD
RAILWAYS: SURFACE TRACK
151
DF
RAIL JOINTS
{28}
187
DF
.~ Chair {3}
188
DF
.~.~ Twin {5}
193
DF
.~.~.~ Interlocked base sections {1}
194
.~.~.~.~ Longitudinal keys
DEFINITION
Classification: 238/194
(under subclass 193) with the addition of longitudinal keys for locking the members together.