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In 1931, electromagnetic lenses helped scientists see a world ordinary microscopes could not reach
In 1931, electron microscopy took a major step forward. The first prototype electron microscope is generally dated to 1931, but Ruska later described the first electron microscope in the modern sense ...
The invisible world : early modern philosophy and the invention of the microscope / Catherine Wilson
https://siris-libraries.si.edu/ipac20/ipac.jsp?&profile=liball&source=~!silibraries&uri=full=3100001~!472505~!0#focus ...
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