
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
circa 1950
1948
1950
1949
1938 and 1951
circa 1950
1948
1948
2000-100 BCE
1950
1955; 1830
1948
1949
1948
1948
1948
1950
1949
1949
1839 (original); circa 1988 (replica)
1950
1948
4000-2001 BCE
1950
1903 (original); 1982 (model)
1949
1948
1990-95
1950
1949
1950
1948
1949
1948
1948
1948
1950
1949
circa 3000 BCE
pre-1948
circa 1948
1949