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Addac adding machine
1926
1926
1930-1940
1948
1946
1950-1959
1955
1950-1959
1955
1943
1948
1957
1920-1940
1931
1911
1927
circa 1920
circa 1900
after 1903
1935
1957
1926
1923-1941
1936-1955
1914
1924
1901
1900-1950
1921
1900-1950
1900-1950
1926
1956
1910-1936
1940-1944
1900-1950
2000-100 BCE
1906-1915
1901-1930
1953
1900-1910
1953-1958
1959
1901-1930
1920-1928
1925
1925-1958
1910-1936
1921-1926
1958
1934