Penicillin powder in bottle
1942
1942
1940
1938
1940
1938
1938
1938
1938
1940
1942
1940
1936
1936
1937
1937
1938
1938
1955; 1830
circa 1938
1936
1938-1940
2000-100 BCE
1937-1938
1937-1937
1937-1938
1938 and 1951
1936
1939
1942
1938
1938
1939
1940
1936
1937
1937
1939
1938
1938
1940
1937
1937
1938
1903 (original); 1982 (model)
circa 1940
1939
1990-96
1940
1936
1938-1939