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| 1900 || Technological development || The theoretic limit of resolution for visible light microscopes (2000 {{w|Å}}) is reached.<ref name="History of Microscopes"/> ||
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| 1903 || Technological development || Austrian-Hungarian chemist {{w|Richard Zsigmondy}} develops the ultra-microscope, which allows the study of objects below the wavelenght of light.<ref name="History of Microscopes"/><ref name="assdfg"/> || {{w|Austria}}
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| 1904 || Technological development || {{w|Carl Zeiss}} introduces the first commercial UV microscope with resolution twice that of a visible light microscope.<ref name="History of Microscopes"/> ||
