Addac adding machine
1926
1926
1926
1927
circa 1930
circa 1927
circa 1930
1930
1928
1927
1924
1927
1931
1930
1934
1931
1928
1926
2000-100 BCE
1930-1931
1955; 1830
before 1928
1931
1928
1927-1929
1927
circa 1930
1930
circa 1927
1926-1928
1990-96
1929
circa 1929
1930
1927
1931
1927
1934
1926
1928
1931
1926
1929
1903 (original); 1982 (model)
1930
4000-2001 BCE
1931
1930
1930 (replica); 1834 (original)
1926
1801-1892 (prepared); 1946 (element replaced)