US PATENT SUBCLASS 404 / 33
.~.~ Integral key to base

Current as of: June, 1999
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404 /   HD   ROAD STRUCTURE, PROCESS, OR APPARATUS

17  DF  PAVEMENT {9}
32  DF  .~ Rubber or rubber-like {1}
33.~.~ Integral key to base

DEFINITION

Classification: 404/33

(under subclass 32) Rubber or rubber-like structure including a projecting portion which provides an interlock means with an undersurface or bed.