
Oxygen cylinder used by climbers on 1953 Mount Everest expedition
1952-3
1952-3
1830 (original); 1967 (model)
1925-1926
1930
circa 1930
1931
1924
circa 1930
2000-100 BCE
1927
1931
1930-1931
1922
1925
1928
1934
Before 1932
before 1928
1932
1928
1932
1955; 1830
1931
1927
1924
1927
1933
1928
1925
1923
1924-1927
1931
1923
1925
1928
1924
1927
1926
1922-1923
1922-1923
1922-1923
1922-1923
1926
1933
1926-1928
1930
1927
1801-1892 (prepared); 1946 (element replaced)
1930 (replica); 1834 (original)
1930