US PATENT SUBCLASS 52 / 539
.~.~ Tongue and groove

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}
539.~.~ Tongue and groove

DEFINITION

Classification: 52/539

(under subclass 519) Structure in which a tongue on an edge of one section closely conforms to and mates with a groove on an adjacent edge of the other section.

SEE OR SEARCH THIS CLASS, SUBCLASS:

536+, for a surfacing of facing sections with tongue and groove on the section faces.

589.1+, for a module of more general application which has integral keying means.