
Oxygen cylinder used by climbers on 1953 Mount Everest expedition
1952-3
1952-3
1949
1830 (original); 1967 (model)
1951
1949
1946
1946
1945
1945-1948
1951
1951
1949
1948-1950
1950
1947
1945
1947
2000-100 BCE
1951
1951
circa 1950
1950
1950
1952
1952
1952
1952
1948
1955; 1830
1950
1951
1946
1951
1944
1951
1951
1946-1948
1938 and 1951
1944-1945
1950-1951
circa 1950
1948
1946
1948
1950
1948
1948
1949
1801-1892 (prepared); 1946 (element replaced)
1948