US PATENT SUBCLASS 238 / 146
.~.~ Integral grooved base


Current as of: June, 1999
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238 /   HD   RAILWAYS: SURFACE TRACK

122  DF  RAILS {20}
143  DF  .~ Detachable head {4}
146.~.~ Integral grooved base


DEFINITION

Classification: 238/146

Compound rails, the base portions being grooved for the reception of the upper portions of the rails.