
Calculating machine invented by Charles Stanhope in 1777, with mahogany case
1777
1777
1955-1965
1913
1929
1930
1775
1950-1955
1955-1965
1960-1970
1960-1965
1960-1965
1960-1970
1965-1970
1955-1965
1955-1965
1935-1950
1950-1951
1950-1965