US PATENT SUBCLASS 52 / 591.4
.~.~.~ Rabbet on two perpendicular faces or edge and face (e.g., ship lap) for key

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

DEFINITION

Classification: 52/591.4

Rabbet on two perpendicular faces or edge and face (e.g., ship lap) for key:

(under subclass 591.1) Integral key on angularly related edge wherein the unit has a groove cut into two exposed intersecting portions that creates a projection which corresponds to a similar groove in an adjacent unit.