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Photographic print of Tchebichef's calculating machine

1925
Photo print, 8 1/2" x 6 1/2", of Selling's calculating machine, 1905

Photo print

1924
Three photographic prints of Bollee's calculating machine: (a) front view; (b) view from above (c) multiplying piece

Three photographic prints of Bollee's calculating machine: (a) front view

1925