Addac adding machine
1926
1926
circa 1927
1926
1927
1934
1923
1924-1927
1928
1927
1924
1925
1928
1927
1925
1927
1926
2000-100 BCE
1925
1928
1922
before 1928
1927-1929
1923
1924
1922-1923
1922-1923
1924
1923
1922-1923
1922-1923
1955; 1830
1925-1928
1925-1927
circa 1927
1925
1926-1928
1990-96
1924
1930 (replica); 1834 (original)
1926
1926
circa 1929
1801-1892 (prepared); 1946 (element replaced)
1928
1922
1922-1925
1924-1927
1924
1922-1924
1925-1926