Comptometer, manual operation
1930-1940
1930-1940
circa 1805
1957
1920-1925
1900-1930
1901-1930
1917
1887-1903
circa 1955
1948-1953
1950-1960
1997
1910
circa 1750
1910
1985
1984
circa 1972
1994
1951
1867
1867
1795-1810
1601
1601
1934
1885-1894
1872
1901-1930
1663
circa 1964
1588
1950-1960
1588
1588
1588
1859
1755
1925-1935
1955-1965
circa 1900
1915-1920
1890
1997
2011
1988
1988