
Addac adding machine
1926
1926
1931
1927
1927
circa 1930
1928
1932
1931
1931
1927
1930
circa 1930
1928
1932
1925
1924
1955; 1830
1925-1928
1928
1927
1926
1925
1934
1931
2000-100 BCE
Before 1932
before 1928
1932
1930-1931
1925
1927-1929
1925-1927
1928
1926
1930
circa 1927
1929
1925-1930
1903 (original); 1982 (model)
1925
1990-96
1830 (original); 1967 (model)
1952-3
1930
1839 (original); circa 1988 (replica)
1930 (replica); 1834 (original)
1925
1925
1926-1932
1926-1928