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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"/> ||
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| 1924 || Scientific development || French physicist {{w|Louis de Broglie}} develops his theory showing that particles have wave properties and very short wavelenghts. This discovery would allow the develop,et development of the {{w|electron microscope}}.<ref name="Introduction to Microscopy by Means of Light, Electrons, X Rays, or Acoustics"/> ||{{w|France}}
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| 1927 || Scientific development || German physicist {{w|Hans Busch}} demonstrates that a suitably shaped magnetic field could be used as a lens to create electron microscopes.<ref name="Introduction to Microscopy by Means of Light, Electrons, X Rays, or Acoustics"/> || {{w|Germany}}
