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The first microscope was invented.
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Anton van Leeuwenhoek viewed bacteria under a microscope for the first time.
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Joseph Jackson Lister discovers that by using different lenses you can create clear magnification.
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Richard Zsigmondy invents the ultramicroscope.
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Transparent materials are studied for the first time.
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The electron microscope was developed.
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The specimen images possible with the invention of the scanning tunnel.