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| 1830 || Technological development || [[w:Achromatic lens|Achromatic microscopes]] are invented.<ref name="BiologyBiology"/> ||
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| 1833 || Scientific development || Scottish scientist [[w:Robert Brown (botanist, born 1773)|Robert Brown]] becomes the first to describe his observation of the nucleus in plant cells.<ref name="BiologyBiology"/>|| {{w|United Kingdom}}
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| 1839 || Organization || The {{w|Royal Microscopical Society}} is founded in {{w|London}}.<ref>{{cite web |title=Royal Microscopical Society's Competitors, Revenue, Number of Employees, Funding and Acquisitions |url=https://www.owler.com/company/royalmicroscopicalsociety |website=owler.com |accessdate=30 January 2019}}</ref> || {{w|United Kingdom}}
