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