// todo need optimize like in event.jsp. Add indexing or not indexing this page. Hans and Zacharias Janssen (apr 21, 1590 – jul 1, 1590) (Timeline)

Hans and Zacharias Janssen (apr 21, 1590 – jul 1, 1590)

Produced first compound microscope

22 Sep 2017

apr 21, 1590

jul 1, 1590

~ 2 months and 11 days

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