
Addac adding machine
1926
1926
1927
1927
1927
1925
1924
1955; 1830
1927
1926
1925
1934
2000-100 BCE
1925
1925-1927
1926
circa 1927
1903 (original); 1982 (model)
1925
1990-96
1830 (original); 1967 (model)
1952-3
1839 (original); circa 1988 (replica)
1925-1926
4000-2001 BCE
1927
1926
1930 (replica); 1834 (original)
1925
1925
1801-1892 (prepared); 1946 (element replaced)
1926
1934
1925
1925; 1862
1927
1834-1836
circa 1925
1927
1925
circa 1925
1940-03
1942-09
1942-07
1942-07
1939-02
1963-01
1938-10
1947-04
1940-01
1946-01