US PATENT SUBCLASS 52 / 607
.~.~ Additional intersecting, transversing passage, or groove

Current as of: June, 1999
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52 /   HD   STATIC STRUCTURES (E.G., BUILDINGS)

596  DF  OPAQUE STONELIKE MODULE {9}
606  DF  .~ With traversing passage {1}
607.~.~ Additional intersecting, transversing passage, or groove

DEFINITION

Classification: 52/607

(under subclass 606) Structure wherein the module has an additional passage or a groove extending through the unit and intersecting and cooperating with the first passage.

SEE OR SEARCH THIS CLASS, SUBCLASS:

505, for a combination of preshaped units forming a barrier having two-way interior passage intercommunication.