US PATENT SUBCLASS 52 / 505
.~ Horizontal and vertical communication

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

503  DF  HOLLOW BLOCKS ARRANGED TO FORM PASSAGEWAY {2}
505.~ Horizontal and vertical communication

DEFINITION

Classification: 52/505

(under subclass 503) Structure wherein the through passages or channels in the modules are located so that they form continuous passages through the barrier in both horizontal and vertical directions, e.g., tortuous or lattice like passages.