Addac adding machine
1926
1926
1926
1927
circa 1927
1928
1927
1924
1927
1934
1928
1926
2000-100 BCE
1955; 1830
before 1928
1928
1927-1929
1927
circa 1927
1926-1928
1990-96
1929
circa 1929
1927
1927
1934
1926
1928
1926
1929
1903 (original); 1982 (model)
4000-2001 BCE
1930 (replica); 1834 (original)
1926
1801-1892 (prepared); 1946 (element replaced)
1830 (original); 1967 (model)
1929
1927
1989-08
1928
1929
1929
1927
1730; 1967
1929
1928
1972-3
2500 BCE
1926
1950-1920
1927