
Oxygen cylinder used by climbers on 1953 Mount Everest expedition
1952-3
1952-3
1830 (original); 1967 (model)
1930
circa 1930
1928
1934
1931
circa 1930
1928
1931
1928
1931
before 1928
1928
1924
2000-100 BCE
1930-1931
1931
1955; 1830
1930
1934
1801-1892 (prepared); 1946 (element replaced)
1930
1931
1839 (original); circa 1988 (replica)
1928
1928
1930
1931
4000-2001 BCE
1903 (original); 1982 (model)
1930 (replica); 1834 (original)
1990-95
before 1930
1930
1928
1936
1931
1929
1834-1836
1930s
1930s
1929
1929
1931
1930
1930
1929
1931
1931