US Patent 3005282 for Lego bricks.
Printed on Archival matte art paper.
This invention relates to toy building elements and more particularly to toy building bricks or blocks adapted to be connected together by means of projections extending from the faces of the elements and arranged so as to engage protruding portions of an adjacent element when two such elements are assembled. Toy elements of this kind will be referred to generally as building bricks, and the principal object of the invention is to provide improved coupling means for such bricks thus providing for a vast variety' of combinations of the bricks for making toy structures of many different kinds and shapes.
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