Addac adding machine
1926
1926
1926
1927
circa 1927
1925
1927
1924
1925
1927
1934
1926
2000-100 BCE
1955; 1830
1925-1927
1925
1927
circa 1927
1925
1990-96
1927
1925-1926
1925
1927
1934
1926
1926
1903 (original); 1982 (model)
4000-2001 BCE
1925
1925
1930 (replica); 1834 (original)
1926
1801-1892 (prepared); 1946 (element replaced)
1830 (original); 1967 (model)
1927
1989-08
circa 1925
1925
1925
1927
1730; 1967
circa 1925
circa 1925
1972-3
1925
2500 BCE
1926
1950-1920
1925
1927