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In which year was the earliest known patent applications for the electron microscope made?
1925
1928
1933
1930
Answer
The earliest known patent applications for the electron microscope were made in 1928. The patent was filed by Max Knoll and Ernst Ruska, who are credited with inventing the first electron microscope in 1931. The electron microscope is a powerful tool that allows scientists to view objects that are too small to be seen with a light microscope.
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