The electron microscope was invented in Germany during the 1930's by _____.
Anton van Leeuwenhoek
Robert Hooke
Hans and Zaccharias Janssen
Charles Spencer
Max Knott and Ernst Ruska
Spencer, maybe?
Anton van Leeuwenhoek
Robert Hooke
Hans and Zaccharias Janssen
Charles Spencer
Max Knott and Ernst Ruska
Spencer, maybe?