
Oxygen cylinder used by climbers on 1953 Mount Everest expedition
1952-3
1952-3
1830 (original); 1967 (model)
1947
1947
1948
1938 and 1951
1948
1948
2000-100 BCE
1955; 1830
1948
1948
1948
1948
1839 (original); circa 1988 (replica)
1947
1947-1948
1948
1947
4000-2001 BCE
circa 1947
1947
1903 (original); 1982 (model)
1948
1990-95
1947
1947
1948
1948
1948
1947
1948
1947
1947
circa 3000 BCE
pre-1948
circa 1948
1947
2000-1350
1950-1900
Post 1947
1948
1947
pre-1948
1972-3
1947
2000-1000
1950-1920
1948
1948