
Addac adding machine
1926
1926
1927
1927
1924
circa 1930
1928
1927
1930
circa 1930
1928
1925
1924
1955; 1830
1925-1928
1928
1924
1927
1926
1922-1923
1922-1923
1921
1922-1923
1922-1923
1921-1926
1925
1923
1924-1927
1934
1921
2000-100 BCE
before 1928
1923
1921-1930
1925
1922
1927-1929
1925-1927
1928
1926
1930
circa 1927
1929
1925-1930
1903 (original); 1982 (model)
1925
1990-96
1924-1930
1830 (original); 1967 (model)
1952-3
1930