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From the collection of National Museum of American History. Free to download, adapt and use — no permission needed.
About this work
Patent model for John Clark, “Telescope Level,” U.S. Patent 218,710 (August 19, 1879). Clark lived in Washington, D.C., and was probably a machinist at the U.S. Naval Observatory.
National Museum of American History’s own descriptionCredit lineLevel. National Museum of American History. CC0.
