
Oxygen cylinder used by climbers on 1953 Mount Everest expedition
1952-3
1952-3
1950
1949
1830 (original); 1967 (model)
1949
1948-1950
1950
1950
1947
1947
circa 1950
1948
1950
1949
1946
1946-1948
1938 and 1951
1946
circa 1950
1948
1946
1948
2000-100 BCE
1950
1955; 1830
1946
1948
1949
1948
1948
1948
1950
1801-1892 (prepared); 1946 (element replaced)
1949
1949
1839 (original); circa 1988 (replica)
1950
1947
1947-1948
1948
1947
1946-1948
4000-2001 BCE
circa 1947
1950
1947
1903 (original); 1982 (model)
1949
1948
1990-95