Addac adding machine
1926
1926
circa 1927
circa 1930
1928
circa 1930
1930
1924
1928
1925
1925
1930
1924
circa 1930
1926
1927
1934
1928
1924-1927
1927
1926
2000-100 BCE
1924
1927
1925
1955; 1830
1927
1925-1928
before 1928
1927-1929
1925-1927
circa 1927
1990-96
1930
1930 (replica); 1834 (original)
1926
circa 1929
1924-1927
1927
1929
1926-1928
1934
1925-1930
1925-1926
1925
1924
1924
1839 (original); circa 1988 (replica)
1801-1892 (prepared); 1946 (element replaced)
1926
1928