Epact Scientific Instruments of Medieval and Renaissance Europe

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 Johann Christoph Keller
Johann Christoph Keller was a mathematician from Linz and is known as the maker of several sundials which can be dated to circa 1600.

For instruments by Johann Christoph Keller, see:
   Equinoctial Dial, Signed by Johann Christoph Keller, Linz, circa 1580 (Oxford, MHS)
   Inclining Dial, Signed by Johann Christoph Keller, Linz, circa 1600 (Oxford, MHS)

References:

E. Zinner, Deutsche und Niederl?ndische astronomische Instrumente des 11. bis 18. Jahrhunderts (2nd ed., Munich, 1967), p. 404.