CC0 · no rights reserved
Patent model for printers' quoins
From the collection of National Museum of American History. Free to download, adapt and use — no permission needed.
About this work
This patent model demonstrates an invention for mechanical quoins, which expanded by means of paired screw gears; the invention was granted patent number 93603.
National Museum of American History’s own descriptionCredit linePatent model for printers' quoins. ca 1869. Dorrity, Daniel. National Museum of American History. CC0.
