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OpenStudy (thedj4jc):
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?
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OpenStudy (thedj4jc):
@Rushwr I'm really sorry if I annoying you :-/
OpenStudy (thedj4jc):
It was Knott and Ruska
OpenStudy (thedj4jc):
It's alright
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