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| Johann Christoph Keller |
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| 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.
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