
Oxygen cylinder used by climbers on 1953 Mount Everest expedition
1952-3
1952-3
1830 (original); 1967 (model)
1934
1931
1932
1931
1931
1932
2000-100 BCE
Before 1932
1931
1955; 1830
1934
1801-1892 (prepared); 1946 (element replaced)
Before 1932
1931
1839 (original); circa 1988 (replica)
1931
4000-2001 BCE
1903 (original); 1982 (model)
1990-95
1936
1931
1834-1836
circa 1932
1932
1932
1931
1931
1931
circa 1932
circa 1932
circa 3000 BCE
2000-1350
1950-1900
1931
1972-3
2000-1000
1950-1920
1932
1932
1931
circa 1932
1931
1931
1931
1931
1931
1932
1932