
Oxygen cylinder used by climbers on 1953 Mount Everest expedition
1952-3
1952-3
1830 (original); 1967 (model)
2000-100 BCE
1938
1938
circa 1938
1937
1937
1938
1938
1938
1938
1955; 1830
1939
1938 and 1951
1937-1937
1937-1938
1937-1938
1938
1938
1939
1938
1801-1892 (prepared); 1946 (element replaced)
4000-2001 BCE
1937
1938
1839 (original); circa 1988 (replica)
1937
1938
1938
1937
1938-1939
1937-1938
circa 1939
1903 (original); 1982 (model)
1938
1937
1938
1990-95
1938
1938
1937
1938-07-09
1938
1962-05
1937
1960-1979
1939
1937
1939