Tongue and groove

Tongue and groove is a method of fitting similar objects together, edge to edge, used mainly with wood, in flooring, parquetry, panelling, and similar constructions. A strong joint, it allows two flat pieces to be joined strongly together to make a single flat surface. Before plywood became common, tongue-and-groove boards were also used for sheathing buildings and to construct concrete formwork.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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