Addac adding machine
1926
1926
1934
1920-1925
1917
circa 1927
circa 1930
1920-1935
1921
1926
1934
1935
1935
1927
1934
1923
1924-1927
1928
1934-1935
1918-1922
1927
1935
circa 1930
1918
1920-1929
1932
1920
1930
1917
1924
1925
1928
1927
1931
1931
1935
1925
1931
1927
circa 1920
1935
1926
2000-100 BCE
1920-1928
1925
1921-1926
1917-1918
1930
1925-1935
1920-1930
1929-1935