Calculating machine, Thomas de Colmar type in wooden case with lid, A. Burkhardt und Cie, Glashütte, Saxony, Germany Calculating machine 1880-1884
Ultra electromechanical calculating and listing machine by Oerlikon, serial no. 207563 Ultra electromechanical calculating and listing machine by Oerlikon
Adding machine by London Computator Ltd. model 509/D/50,224. Adding machine by London Computator Ltd. model 509/D/50 1915-1925
"Sumlock" adding/calculating machine no.912/S/3475 "Sumlock" adding/calculating machine no.912/S/3475 1950
"Arithmograph" of Leon Bollee, with stylus, instructions for use and sets of mathematical tables printed on two cards, together with a tin mask, 2" x 1 3/8" "Arithmograph" of Leon Bollee 1895-1900
Calculating machine, National 4 - register automatic bookkeeping calculating machine, class 30411 (21), serial no.3068614; motor-driven, on metal stand, with wooden side table and cloth cover. Full keyboard; adding capability; printing ability Calculating machine for bookkeeping 1935