
Oxygen cylinder used by climbers on 1953 Mount Everest expedition
1952-3
1952-3
1830 (original); 1967 (model)
1940
1940
1938
1937
1940
1938
1940
1938
1938
1938
1938
1940
1938-1940
1940
1937-1937
1938
1938
1955; 1830
1937-1938
1938
1937-1938
1937
1938
1937
1939
2000-100 BCE
1938 and 1951
1937
1938
1938
1940
circa 1939
1937-1938
circa 1940
1939
1990-96
1903 (original); 1982 (model)
4000-2001 BCE
1938
1939
1839 (original); circa 1988 (replica)
1938
1937
1937
1937
1938
1940
1801-1892 (prepared); 1946 (element replaced)