US PATENT SUBCLASS 52 / 591.3
.~.~.~ Key designed for four direction lock

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

578  DF  MODULE OR PANEL HAVING DISCRETE EDGEWISE OR FACE-TO-FACE CONNECTING FEATURE {6}
589.1  DF  .~ Having integral key {3}
591.1  DF  .~.~ Key on angularly related edges or faces {3}
591.3.~.~.~ Key designed for four direction lock

DEFINITION

Classification: 52/591.3

Key designed for four direction lock:

(under subclass 591.1) Integral key on angularly related edge wherein the unit contains a projection which prevents

movement in the horizontal and vertical planes.