
Oxygen cylinder used by climbers on 1953 Mount Everest expedition
1952-3
1952-3
1830 (original); 1967 (model)
1920
1920
1955; 1830
1921
1934
1921
2000-100 BCE
circa 1920
1920
circa 1920
circa 1920
1920
1801-1892 (prepared); 1946 (element replaced)
1920
1920
1930 (replica); 1834 (original)
1839 (original); circa 1988 (replica)
1921
4000-2001 BCE
circa 1920
1903 (original); 1982 (model)
1934
1936
1990-95
1610; 1923
1834-1836
1925; 1862
1962-05
1921
1668; 1924
1960-1979
1921
1920
1920
1970-1900
1920
1921
1920
1920
circa 1920
circa 1920
30 CE
30 CE
2686-2613 BCE
1921
1921
1920
1859; 1986