
Oxygen cylinder used by climbers on 1953 Mount Everest expedition
1952-3
1952-3
1830 (original); 1967 (model)
1920
1924
2000-100 BCE
1922
1921
1934
1920
1955; 1830
1924
1923
1921
1923
1924
circa 1920
1920
circa 1920
1922-1923
1922-1923
1922-1923
1922-1923
circa 1920
1920
1801-1892 (prepared); 1946 (element replaced)
1930 (replica); 1834 (original)
4000-2001 BCE
circa 1920
1934
1839 (original); circa 1988 (replica)
1920
1924
1920
1922-1923
1922
1924
1922-1924
1924
1920-1922
1921
1922
1923
1923
1903 (original); 1982 (model)
1923
1923
1922-1924
1923
1922-1923
1922-1923