US PATENT SUBCLASS 52 / 591.1
.~.~ Key on angularly related edges or faces

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.~.~ Key on angularly related edges or faces {3}
591.2  DF  .~.~.~> Multiple, finite keys (e.g, perpendicular sawtooth)
591.3  DF  .~.~.~> Key designed for four direction lock
591.4  DF  .~.~.~> Rabbet on two perpendicular faces or edge and face (e.g., ship lap) for key {1}

DEFINITION

Classification: 52/591.1

Key on angularly related edges or faces:

(under subclass 589.1) Integral key wherein one unit has at least two projections that are located on two surfaces which share a common juncture plus the unit engage indentations on an adjacent unit.