
Cardiac pacemaker, London, England, 1961-1962
1961-1962
1961-1962
(1962); 1982
1950-1953
1945
1953
1939-1955
1958
1960
1965
1949
1961
1950
1934
1948
1935-1945
1940-1945
1966-1970
1963
circa 1956
1947
1938
1937-1960
1966
1947
1965
1967
1951
1946; 1946
1943
1944
1936
1948-1953
1937
1976
1954-1968
1956
1970-1971
1970s
1963
1945
1971
1938
1971
1947
1947
1940
1938
1955
1938
1938