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