US PATENT SUBCLASS 52 / 590.2
.~.~.~ Keys, mortises, or key and mortise on opposed faces or edges

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}
590.1  DF  .~.~ Dovetail-type key {2}
590.2.~.~.~ Keys, mortises, or key and mortise on opposed faces or edges

DEFINITION

Classification: 52/590.2

Keys, mortises, or key and mortise on opposed faces or edges:

(under subclass 590.1) Integral dovetail key wherein one unit has sides that are substantially parallel and said sides have: (1) at least two fan-shaped projections with at least one projection on each side or (2) at least two fan-shaped indentations with at least one indentation on each side; or (3) at least one fan-shaped indentation on one side and a fan-shaped projection on the other side.