
Oxygen cylinder used by climbers on 1953 Mount Everest expedition
1952-3
1952-3
1950
1949
1951
1830 (original); 1967 (model)
1949
1951
1950
1950
1949
1951
1951
1951
1951
1938 and 1951
1950-1951
circa 1950
1950
1950
1955; 1830
1952
1952
1952
1952
2000-100 BCE
1951
1951
circa 1950
1949
1949
1950
1949
1951
1952
1952
1952
1950
1952
4000-2001 BCE
1839 (original); circa 1988 (replica)
1950-1951
1951
1950-1951
1950
1903 (original); 1982 (model)
1949
1990-95
1951
1950
April 1952