Addac adding machine
1926
1926
1926
1927
1955; 1830
circa 1927
1934
1927
2000-100 BCE
1927
1926
1927
1924
1927
1926
1930 (replica); 1834 (original)
circa 1927
1903 (original); 1982 (model)
1990-96
1926
1934
1926
1830 (original); 1967 (model)
1927
4000-2001 BCE
1801-1892 (prepared); 1946 (element replaced)
1962-05
1927
1927
1926
1970-1900
10000-5000 BCE
1926
1927
1926
1927
1927
1927
1926
1927
1927
1927
circa 1927
1927
1927
1917
1926
1926
1926
1926
1926