The original US patent drawing for the Lego brick, filed 60 years ago: https://kottke.org/18/01/the-original-us-patent-drawing-for-the-lego-brick-filed-60-years-ago
(original)
The original US patent drawing for the Lego brick, filed 60 years ago: https://kottke.org/18/01/the-original-us-patent-drawing-for-the-lego-brick-filed-60-years-ago
(original)