
Oxygen cylinder used by climbers on 1953 Mount Everest expedition
1952-3
1952-3
1830 (original); 1967 (model)
1940
1839 (original); circa 1988 (replica)
circa 1939
1940
1990-96
1938
2000-100 BCE
1938
1940
1940
1990-95
1938 and 1951
1910 - 1954
1938
1940
1940
circa 1938
1938-1940
1940
1903 (original); 1982 (model)
circa 1940
4000-2001 BCE
1941
1960-1979
1938 - 2000
2050-1750 BCE
1940
1938
1938
1955; 1830
1939
1798 (original); 1977 (model)
1939-06-09
1879 (1956)
2000-1001 BCE
1940-1941
1938
1938
1938
1939
1801-1892 (prepared); 1946 (element replaced)
1888; 1984
6000-5000BCE
circa 1940
1938
1940
1939
circa 1940s