
Oxygen cylinder used by climbers on 1953 Mount Everest expedition
1952-3
1952-3
1830 (original); 1967 (model)
1925-1926
1928
1922
1927
1925
1928
1927
1925
1923
1924-1927
1934
2000-100 BCE
before 1928
1925
1928
1927
1924
1924
1927
1928
1926
1926
1922-1923
1922-1923
1922-1923
1922-1923
1955; 1830
1924
1923
1924
1839 (original); circa 1988 (replica)
1926-1928
1925
1923
1934
1922-1923
1922-1923
1922-1923
1922-1923
1922-1923
1922-1923
1922-1923
1923
1923
1927
1924-1927
1801-1892 (prepared); 1946 (element replaced)
1922-1925