
Addac adding machine
1926
1926
1931
1927
1927
1924
circa 1930
1928
1932
1931
1931
1927
1930
circa 1930
1928
1932
1933
1925
1924
1955; 1830
1925-1928
1928
1933
1931
1924
1927
1926
1926
1924-1927
1934
2000-100 BCE
Before 1932
before 1928
1932
1930-1931
1925
1927-1929
1925-1927
1928
1925
1933
1930
circa 1927
1929
1925-1930
1903 (original); 1982 (model)
1925
1933
1933
1990-96
1924-1930