
Oxygen cylinder used by climbers on 1953 Mount Everest expedition
1952-3
1952-3
1830 (original); 1967 (model)
1930
circa 1930
circa 1930
2000-100 BCE
1927
1928
1934
before 1928
1928
1955; 1830
1927
1927
1928
1928
1924
1927
1930
1927
1801-1892 (prepared); 1946 (element replaced)
1930 (replica); 1834 (original)
1930
1928
4000-2001 BCE
1934
1839 (original); circa 1988 (replica)
1928
1930
1903 (original); 1982 (model)
1936
1990-95
1834-1836
circa 1930
1928
before 1930
1927
1930s (1888)
circa 1930
1929
1929
1962-05
1930s
1960-1979
1929
1927
1929
1930
1930
1928