Addac adding machine
1926
1926
1920
1924
1925
1925
1925
1921-1926
1922
1923
1924
1922-1923
1922-1923
1922-1923
1922-1923
circa 1920
1920
1955; 1830
1921
1921
1926
1924
1923
1920-1925
1919
1926
2000-100 BCE
1923
circa 1920
1934
1920-1925
1920
1920
1925
1990-96
1920
1924
1920
1930 (replica); 1834 (original)
1926
1926
1801-1892 (prepared); 1946 (element replaced)
1919
1922
1923
1923
circa 1919
1922-1923
1922-1923
1922-1923
1922-1923