Addac adding machine
1926
1926
1926
1927
1935
circa 1930
1934
1929-1935
1932
1935
circa 1927
circa 1930
1930
1924
1925
1935
1928
1922
1927
1923
1924
1925
1924-1927
1922-1923
1922-1923
1922-1923
1922-1923
1934
1927
1923
1931
1930
1934
1931
1934
1928
1935
1926
2000-100 BCE
1924
1925-1935
1929-1935
1930-1931
1935
1935
1955; 1830
1934
1932
1933
1925-1928
before 1928