US PATENT SUBCLASS 404 / 40
.~.~ With separate interlocking member

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

17  DF  PAVEMENT {9}
34  DF  .~ Modules or blocks (preformed) {9}
40.~.~ With separate interlocking member

DEFINITION

Classification: 404/40

(under subclass 34) Preformed module structure wherein individual modules are united or held against relative movement by means of a discrete key.