US PATENT SUBCLASS 238 / 7
.~.~ Concrete

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

2  DF  ROADBED {4}
6  DF  .~ Continuous {1}
7.~.~ Concrete

DEFINITION

Classification: 238/7

(under subclass 6) Structure wherein the road-bed covering is of concrete or other plastic compound.