
Oxygen cylinder used by climbers on 1953 Mount Everest expedition
1952-3
1952-3
1940
1830 (original); 1967 (model)
1940
1940
1939
1938 and 1951
2000-100 BCE
1940
1955; 1830
1939
1940
circa 1940
1801-1892 (prepared); 1946 (element replaced)
1940
1839 (original); circa 1988 (replica)
1940
4000-2001 BCE
circa 1939
1903 (original); 1982 (model)
1990-95
1940
1940
1940
circa 3000 BCE
1940
1939
circa 1939
1941
2000-1350
1950-1900
1941
1941
1939
1940
1940
1940
1972-3
1941
1940
2000-1000
1950-1920
post 1941
circa 1941
circa 1940
circa 1941
circa 1941
1939
1939
1940