File:US3005282A Toy building brick (1958 filed, 1961 published) by Christiansen Godtfred Kirk - Lego brick, p.2, Fig. 7~12.png
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![File:US3005282A Toy building brick (1958 filed, 1961 published) by Christiansen Godtfred Kirk - Lego brick, p.2, Fig. 7~12.png](https://upload.wikimedia.org/wikipedia/commons/thumb/7/77/US3005282A_Toy_building_brick_%281958_filed%2C_1961_published%29_by_Christiansen_Godtfred_Kirk_-_Lego_brick%2C_p.2%2C_Fig._7~12.png/408px-US3005282A_Toy_building_brick_%281958_filed%2C_1961_published%29_by_Christiansen_Godtfred_Kirk_-_Lego_brick%2C_p.2%2C_Fig._7~12.png?20180719081638)
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