US PATENT SUBCLASS 52 / 591.5
.~.~.~.~ With additional locking feature (e.g., fastener)

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}
591.4  DF  .~.~.~ Rabbet on two perpendicular faces or edge and face (e.g., ship lap) for key {1}
591.5.~.~.~.~ With additional locking feature (e.g., fastener)

DEFINITION

Classification: 52/591.5

With additional locking feature (e.g., fastener):

(under subclass 591.4) Integral key on angularly related rabbeted edge wherein the projection includes another distinct element that ensures contact with an adjacent unit.