Graduation certificate and patent
Buffalo and Erie County Historical Society
25 Nottingham Court
Buffalo, NY 14216-3199
Graduation certificate of Julius J. Lankes, from The Buffalo Commerical and Electro-Mechanical Institute engineering department, 21 Oct. 1902; and patent for calculating machine invented by William S. Gubelmann, with drawings by J.J. Lankes, filed 19 Sept. 1912, and patented 4 Aug. 1931.