Addac adding machine
1926
1926
1926
1927
1955; 1830
1925-1928
circa 1927
1925
1934
1924-1927
1922-1923
1922-1923
1922-1923
1922-1923
1927
1923
before 1928
2000-100 BCE
1928
1927
1923
1926
1924
1928
1924
1925
1928
1925-1927
1925
1922
1927
1923
1924
1927
1925
1926
1925
1930 (replica); 1834 (original)
circa 1927
1903 (original); 1982 (model)
1925
1926-1928
1990-96
1922-1925
1926
1922-1925
1922
1923
1923
1922-1924
1922-1924