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Signature	Maker	Instruments	Comments	Location	References
SOMMER, JOHANN	Germany, 1636-1702, MIM	Universal Ring Sundials = ADL-T7, GRA, KRE; Sundials = STU, LUN.	the universal ring sundial at the ADL is signed on the outer surface of the equatorial circle and the name can not be seen when the dial is folded; some reproductions, in silver, of a universal ring sundial, signed "Johann Sommer" have appeared in the London market.	Augsburg.	Zinner 1; Bobinger 2; Michel 3; Tomlinson 1; ADL; RSW.
SOMMER, JOHANN	Germany, 1636-1702, MIM	Universal Ring Sundials = ADL-T7, GRA, KRE; Sundials = STU, LUN.	the universal ring sundial at the ADL is signed on the outer surface of the equatorial circle and the name can not be seen when the dial is folded; some reproductions, in silver, of a universal ring sundial, signed "Johann Sommer" have appeared in the London market.	Augsburg.	Zinner 1; Bobinger 2; Michel 3; Tomlinson 1; ADL; RSW.

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