(under subclass 519) Structure in which one of the sections has a flange which is generally perpendicular to the plane of its exposed face, which flange engages a similar flange or opposed face on the adjacent section overlapping it.
SEE OR SEARCH THIS CLASS, SUBCLASS:
536+, for overlapping facing sections with face-to-face preformed closely mated tongue and groove joints.
588.1, for a structure formed by coplanar facers with interfitted lateral flanges.
593+, for a structure formed by a shaft and facers with abutting clamped flanges.
