US PATENT SUBCLASS 52 / 536
.~.~ Face-to-face tongue and groove; e.g., dado

Current as of: June, 1999
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52 /   HD   STATIC STRUCTURES (E.G., BUILDINGS)

518  DF  LAPPED MULTIPLANAR SURFACING; E.G., SHINGLE TYPE {7}
519  DF  .~ Interfitted sections {14}
536.~.~ Face-to-face tongue and groove; e.g., dado {2}
537  DF  .~.~.~> Meshing corrugated sheet type
538  DF  .~.~.~> Plural opposed flanges

DEFINITION

Classification: 52/536

(under subclass 519) Structure in which a major face of one section has thereon a tongue, flange or rib, and is in face-to-face contact with the adjacent section which has a groove which closely conforms to and mates with the tongue, flange, or rib, which groove may also be formed by flanges.