The attachment uses a groove and tongue system.

The tongue-and-groove edges (3, 4) are designed in such a way that, upon joining two boards (1, 2; 1a, 2a) together with a tongue-and-groove joint, the junction develops an outward-facing seam groove (9).

The receiving bushing is secured against torsion by a mortise and tenon combination.

The invention relates to an earthquake-resistant wall comprising a metal structure and tongue-and-groove panels for the construction thereof.

The lower section is attached to the upper section by means of a cooperating tongue-and-groove (36) connection.

Interlocking design such as tongue-and-groove is provided on at least two sides of the engineered flooring.

The housing halves (9, 11) are interlinked by matching tongue-and-groove joints (33).

A tongue-and-groove arrangement provides a secondary coupling between the assembly and the housing when the handle is in the operating positions.

Hold each board at a 45-degree angle and line up the tongue-and-groove connectors.

A flame resitant room divider (10, 44) comprising two curtains (12,46), said curtains (12,46) having a central layer (20,48) between two other layers (22, 50).

The blocks connect using a tongue-and-groove design at each end of the block.

A tongue-and-groove (34, 36) arrangement may be used to align the plug with the frame, and the plug is preferably polarized.

In order to stabilize the magazine (3) inside the housing (2), at least one groove-and-tongue slideway is located between the magazine (3) and the housing (2).

As a general rule, the best results for a driftwood bed come from the old-fashioned tongue-and-groove method.

Embodiments of the present technology include connection joints that are strong and allow for the use of less material than is needed for tongue and groove connection joints.

The interconnecting modular headers can have locking structures in addition to the tongue and groove mating structures for permanently interlocking the modular headers together.