Addac adding machine
1926
1926
1930-1940
1948
1946
1955
1955
1943
1948
1920-1940
1921
1926
1945
1927
1938
1947
1938
1955
1938
1935
1938
circa 1930
1940
1940-1949
1920
1920-1950
circa 1953
1940
1936
1920-1929
1934
1929-1935
1939-1945
1937
1937
1950
1953
1938
1938
1932
1951
1945-1955
1950
1950-1951
1930-1940
1920-1925
circa 1955
1948-1953
circa 1938
1935
1951