
Oxygen cylinder used by climbers on 1953 Mount Everest expedition
1952-3
1952-3
1949
1830 (original); 1967 (model)
1949
1949
1938 and 1951
1948
1948
1947
1948
1955; 1830
2000-100 BCE
1947
1948
1949
1949
1947
1949
1948
1947
1947-1948
1948
1948
1948
4000-2001 BCE
1839 (original); circa 1988 (replica)
circa 1947
1947
1903 (original); 1982 (model)
1949
1948
1990-95
1947
1947-1949
1949
1947
1947
1948
1949
1948
1948
1947
1948
1947
1947
1949
circa 3000 BCE
2000 BCE
1949
pre-1948