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Signature	Maker	Instruments	Comments	Location	References
HUYGENS, CONSTANTIN	Holland, c.1686, OIM	Object Glasses, 1686 = BM, BRO.	brother of Christiaan Huygens; lens of 123-foot focal length lens at the Royal Society in 1723.	The Hague.	Rooseboom 1; USNM; Nachet; Daumas 1; Dewhirst; A.J. Turner 10; Darius 4.
HUYGENS, CONSTANTIN	Holland, c.1686, OIM	Object Glasses, 1686 = BM, BRO.	brother of Christiaan Huygens; lens of 123-foot focal length lens at the Royal Society in 1723.	The Hague.	Rooseboom 1; USNM; Nachet; Daumas 1; Dewhirst; A.J. Turner 10; Darius 4.

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