
Oxygen cylinder used by climbers on 1953 Mount Everest expedition
1952-3
1952-3
1830 (original); 1967 (model)
1946
1938 and 1951
1946
1946
1946
1947
1955; 1830
2000-100 BCE
1947
1947
1947
1801-1892 (prepared); 1946 (element replaced)
4000-2001 BCE
1839 (original); circa 1988 (replica)
circa 1947
1947
1903 (original); 1982 (model)
1990-95
1947
1947
1947
1946
1946
1947
1947
1947
circa 3000 BCE
2000 BCE
post 1946.
1946
1946
1946
1946
1946
1947
2000-1350
1950-1900
Post 1947
1952-3
1952-3
4000-30 BCE
10000-5000 BCE
10000-500 BCE
1947
1946
1946
1946
1972-3