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Addac adding machine
1926
1926
1927
1926
1924
1926
2000-100 BCE
1927
1934
1927
1928
1928
1955; 1830
before 1928
circa 1927
1928
1927
1926
1927
1928
1934
1926
circa 1927
1903 (original); 1982 (model)
4000-2001 BCE
1990-96
1830 (original); 1967 (model)
1926
1801-1892 (prepared); 1946 (element replaced)
1930 (replica); 1834 (original)
1926-1928
1839 (original); circa 1988 (replica)
circa 1928
1940-03
1933-05
circa 1928
1942-09
1942-07
1942-07
1939-02
1963-01
1934-08
1969-03
1969-05
1938-10
1947-04
1940-01
1946-01
1955-10
1947-05
1962-10