Building block for construction or children's toy

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

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D21108, 2501

Patent

active

D03795233

REFERENCES:
patent: D220622 (1971-05-01), Passander
patent: D238144 (1975-12-01), Ketcham
patent: D266362 (1982-09-01), Coelho Dos Santos
patent: D336140 (1993-06-01), Lavery
patent: D340775 (1993-10-01), Sauve
patent: 1544478 (1925-06-01), Payne
patent: 1683441 (1928-09-01), Bone
patent: 3036407 (1962-05-01), Dixon
patent: 4041670 (1977-08-01), Kaplan
patent: 4335549 (1982-06-01), Dean, Jr.
patent: 5507127 (1996-04-01), Gates

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