
Oxygen cylinder used by climbers on 1953 Mount Everest expedition
1952-3
1952-3
1830 (original); 1967 (model)
1925-1926
1928
1932
1955; 1830
1931
1927
1930
circa 1930
1925
1928
1927
1933
1925
1934
1931
2000-100 BCE
Before 1932
before 1928
1932
1925
1928
1931
1927
circa 1930
1924
1927
1926
1931
1930-1931
1928
1926
1933
1930
1933
1839 (original); circa 1988 (replica)
1926-1928
1933
1903 (original); 1982 (model)
1925
1934
1926
Before 1932
1931
1930
1927
1801-1892 (prepared); 1946 (element replaced)
1925-1930
1932-1933