Addac adding machine
1926
1926
1924
1925
1925
1924
1926
1934
1923
1926
2000-100 BCE
1924
1923
1925
1955; 1830
1923
1990-96
1930 (replica); 1834 (original)
1926
1923
1925
1926
1934
1923
1925-1926
1925
1923
1924
1924
1839 (original); circa 1988 (replica)
1801-1892 (prepared); 1946 (element replaced)
1923
1923
1925
1926
1924
1903 (original); 1982 (model)
1925
4000-2001 BCE
1830 (original); 1967 (model)
1923-1925
1925
1925
1923
1925
circa 1926
circa 1926
1953-4
1926
1925
1926