Hospital bed cycle
1946
1946
1950-1951
1948
1946
1948
1947
1951
1946
1949
1947
1951
1946
1948
circa 1950
2000-100 BCE
1938 and 1951
1948
1950
1950
1951
1951
1955; 1830
circa 1950
1950
1949
1951
1948
1950
1946
1951
1946-1948
circa 1950
circa 1950
1951
1951
1951
1990-96
1950
1950
1948
1946-1948
1948
1951
1949
1947
1947-1948
1951
1947
1950
1839 (original); circa 1988 (replica)