1590 - Dutch spectacle-makers, Hans Janssen and his son Zacharias Janssen, claimed by later writers (Pierre Borel 1620 - 1671 or 1628 - 1689 and Willem Boreel 1591 - 1668) to have invented a compound microscope, but this is disputed.
1609 - Galileo Galilei develops an occhiolino or compound microscope with a convex and a concave lens.
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