D15,791, 1885-02-10. Ihlenburg. (Arboret No. 2)
US patent Design No. 15,791, issued 1885-02-10 to Herman Ihlenburg. Filed 1885-01-14 (no application serial number given). "Design for a Font of Printing-Type." Assigned to MacKellar, Smiths & Jordan. This is Arboret No. 2 (which was copied in the 20th century as Arboret).
D16,508, 1886-02-09. Ihlenburg (Crayon)
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