
'Little Professor' electronic calculator, 1980
1980
1980
1930-1945
1965-1975
1945-1965
1911-1930
1955-1960
1911-1930
1921-1940
circa 1970
1851-1900
1900-1930
1950-1959
1910-1950
1930-1950
circa 1964
1876
circa 1962
circa 1965
1968