Who developed the initial refracting spyglass devices before Galileo independently conceived of and improved upon them?

Answer

Dutch spectacle makers

The initial refracting spyglass devices emerged from Dutch spectacle makers in 1608. Galileo heard of these instruments and then independently conceived of and constructed his own versions, rapidly improving the design.

Who developed the initial refracting spyglass devices before Galileo independently conceived of and improved upon them?

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Galileo's Revolutionary Observation - YouTube

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