1946
1938 and 1951
1950
1951
1950-1951
2000-100 BCE
circa 1950
1949
1948
1955; 1830
1950-1952
1947
1946-1950
1946-1948
1990-96
1947-1948
1801-1892 (prepared); 1946 (element replaced)
1903 (original); 1982 (model)
1986 (replica); 1501-1600 (original)