Addac adding machine
1926
1926
1930-1940
1920-1940
1921
1926
1927
1938
1938
1938
1935
1938
circa 1930
1940
1920
1940
1936
1920-1929
1934
1929-1935
1937
1937
1938
1938
1932
1930-1940
1920-1925
circa 1938
1935
circa 1927
circa 1930
1920
1930
1924
1925
1935
1928
1922
1927
1923
1924
1925
1921-1926
1924-1927
1922-1923
1922-1923
1922-1923
1922-1923
1920-1929
1920-1935
1920-1930