Addac adding machine
1926
1926
circa 1927
1928
1924
1928
1925
1925
1924
1926
1927
1934
1923
1928
1924-1927
1927
1926
2000-100 BCE
1924
1923
1927
1925
1955; 1830
1927
1925-1928
before 1928
1923
1925-1927
circa 1927
1990-96
1930 (replica); 1834 (original)
1926
1924-1927
1923
1927
1926-1928
1925
1926
1928
1926
1924
1903 (original); 1982 (model)
1925
4000-2001 BCE
1934
1923
1925-1926
1925
1923
1924
1924