
Addac adding machine
1926
1926
1927
1927
1928
1927
1925
1928
1925
1924
1955; 1830
1925-1928
1927-1929
1928
1927
1926
1928
1925
1926
1934
1925-1927
2000-100 BCE
before 1928
circa 1927
1929
1903 (original); 1982 (model)
1925
1990-96
1926
1830 (original); 1967 (model)
1952-3
1839 (original); circa 1988 (replica)
1930 (replica); 1834 (original)
1925
1925
1926-1928
1927
1801-1892 (prepared); 1946 (element replaced)
1925-1926
1926
1934
1925
1928
1928
4000-2001 BCE
1925; 1862
1927
1834-1836
1929
1925
circa 1925