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Addac adding machine
1926
1926
1927
1926
1924
1926
2000-100 BCE
1930
1927
1934
1927
1928
1930
circa 1930
1928
1955; 1830
1927
before 1928
1927-1929
circa 1927
circa 1930
1928
circa 1930
1926
1927
1928
1934
1926
1930
circa 1927
1929
1903 (original); 1982 (model)
4000-2001 BCE
1990-96
1929
circa 1929
1930
1930
1830 (original); 1967 (model)
1930 (replica); 1834 (original)
1926
1926-1928
1839 (original); circa 1988 (replica)
1930
1801-1892 (prepared); 1946 (element replaced)
circa 1928
1940-03
1933-05
circa 1928
1942-09
1942-07