
Addac adding machine
1926
1926
1931
1927
1927
1924
circa 1930
1928
1931
1931
1927
1925
1930
circa 1930
1928
1925
1924
1955; 1830
1925-1928
1927-1929
1928
1924
1927
1926
1928
1925
1926
1924-1927
1934
1931
1925-1927
2000-100 BCE
before 1928
1930-1931
1924
1930
circa 1927
1929
1925-1930
1903 (original); 1982 (model)
1925
1990-96
1924-1930
1931
1926
1830 (original); 1967 (model)
1952-3
1930
1839 (original); circa 1988 (replica)
1930 (replica); 1834 (original)
1925