Key operated model 16T Brunsviga mechanical calculating machine by Brunsviga Maschinenwerke AG
1950-1955
1950-1955
1931-1939
1957
1950-1955
circa 1930
circa 1930
circa 1930
1935-1939
1936-1939
1935-1939
1892-1893
1936-1939
1908-1912
1952-1959
1940-1950
1910
1932
1910-1915
1930s
1908-1912
1953