Addac adding machine
1926
1926
circa 1927
1927
1924
1925
1927
1925
1925
1922
1923
1924
1922-1923
1922-1923
1922-1923
1922-1923
1955; 1830
1926
1924
1927
1923
1924-1927
1925-1927
1927
1934
1926
2000-100 BCE
1923
circa 1927
1925
1990-96
1924
1930 (replica); 1834 (original)
1926
1926
1801-1892 (prepared); 1946 (element replaced)
1922
1924-1927
1923
1923
1927
1922-1923
1922-1923
1922-1923
1922-1923
1922-1923
1922-1923
1926
1922
1903 (original); 1982 (model)
1830 (original); 1967 (model)