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.