US PATENT SUBCLASS 52 / 592.2
.~.~.~ 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}
592.1  DF  .~.~ Keys, mortises, or key and mortise on opposed edges or faces {3}
592.2.~.~.~ Key designed for four direction lock {1}
592.3  DF  .~.~.~.~> In a vertical arrangement

DEFINITION

Classification: 52/592.2

Key designed for four direction lock:

(under subclass 592.1) Integral key on opposed edges wherein the unit contains a projection which prevents movement in the horizontal and vertical planes.