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Signature	Maker	Instruments	Comments	Location	References
GERBERT D'AURILLAC	France, c. 930-1003,		Pope Sylvester II; mathematician and astronomer; made several armillary spheres and an "oralogium", either a sundial or an astrolabe.	Aurillac; Reims; Rome.	Maddison 2; Michel 2; DSB.
GERBERT D'AURILLAC	France, c. 930-1003,		Pope Sylvester II; mathematician and astronomer; made several armillary spheres and an "oralogium", either a sundial or an astrolabe.	Aurillac; Reims; Rome.	Maddison 2; Michel 2; DSB.

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