Two strips of hydrogel film for use as wound dressing
1984
1984
1950-1980
1947
1947
1967
1956
1958
circa 1930
circa 1897
circa 1965
1959
circa 1963
circa 1953
1911
circa 1912
1911
1911
1896
1934
1911
1911
1911
1911
1911
1927
1932
1950-1980
1965-1974
1960-1970
1929
1967
1966
1895
1952
1956
1956
1911
1911