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Signature	Maker	Instruments	Comments	Location	References
GEMMA, CORNELIUS 1	Belgium, 1535-79, MIM	Astrolabe, 1574 = HAK.	son of Gemma Frisius; astronomer and mathematician; author.	Louvain.	Eckardt 1; Van Ortroy 2; Michel 3; Gunther 1; RSW.
GEMMA, CORNELIUS 1	Belgium, 1535-79, MIM	Astrolabe, 1574 = HAK.	son of Gemma Frisius; astronomer and mathematician; author.	Louvain.	Eckardt 1; Van Ortroy 2; Michel 3; Gunther 1; RSW.

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