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Model, of blade from Crispin's patent 1860 screw propellor
1861
1861
1890
1897
1888
1897-1933
1894
1926
1897
1861
1861
1938
1904
1905
1919
1952
1859
1912
1925-07-04
1926-03-29
1904-1923
1919
1939
1887
1926
1903
1914/09
1835-1880
1914
1857
1896
1922
1911
1884
1866
07 June 1955
1893
1901-11-08
1941-1945
1930-1943
1929-1957
1935
1945
1935
1952
1934