Addac adding machine
1926
1926
1920-1925
1917
circa 1927
1921
1926
1927
1934
1923
1924-1927
1928
1918-1922
1927
1918
1920-1929
1920
1917
1924
1925
1928
1927
1925
1927
circa 1920
1926
2000-100 BCE
1920-1928
1925
1921-1926
1917-1918
1928
1922
before 1928
1927-1929
1923
1924
1920-1928
1920-1925
1919
1922-1923
1922-1923
1924
1923
1922-1923
1922-1923
1920-1929
circa 1920
1920
1955; 1830
1918-1920