Tongue and groove system

Building units and construction elements – Architectural stock material – Construction block or brick type

Design Patent

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Design Patent

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D0495427

CLAIM:
The ornamental design for a tongue and groove system, as shown and described.

REFERENCES:
patent: 3347048 (1967-10-01), Brown et al.
patent: 4320612 (1982-03-01), Jeffries, Jr.
patent: D369417 (1996-04-01), Evans
patent: D481135 (2003-10-01), Dean et al.

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