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Poster with a reproduction of the patent showing a drawing fence by Alfred W Siberini.
Patent No. US3273246A was issued in 1966 by the United States Patent and Trademark Office.
fence is a device consisting of two perpendicular slats. By moving one strip along the drawing board, you can draw parallel lines. You can draw perpendicular or angled lines in combination with a drawing triangle. Drafting gear - poster
Size:8 x 12 inch