US PATENT SUBCLASS 52 / 592.6
.~.~.~ Designed for stacking (e.g., key on top surface, mortise on bottom)

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}
592.6.~.~.~ Designed for stacking (e.g., key on top surface, mortise on bottom)

DEFINITION

Classification: 52/592.6

Designed for stacking (e.g., key on top surface, mortise on bottom):

(under subclass 592.1) Integral key on opposed edges wherein the projection and corresponding indentation are manufactured to prevent movement in the horizontal plane.