Addac adding machine
1926
1926
1926
1927
1955; 1830
1925-1928
1927-1929
circa 1927
1925
1934
1927
before 1928
2000-100 BCE
1928
1927
1926
1928
1925
1928
1925-1927
1925
1927
1927
1925
1926
1925
1930 (replica); 1834 (original)
circa 1927
1929
1903 (original); 1982 (model)
1925
1926-1928
1990-96
1929
circa 1929
1926
1934
1926
1925-1926
1830 (original); 1967 (model)
1927
1925
4000-2001 BCE
1801-1892 (prepared); 1946 (element replaced)
1928
1926-1929
1925
1929
1962-05
1927
1928