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| Origin unknown |
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| While most instruments, whether signed or not, can be attributed to a particular city or region, some remain difficult to place precisely.
| For Origin unknown instruments, see: | | |
Astrolabe, Unsigned, Origin unknown, circa 1400 (Oxford, MHS) |
Astrolabe, Unsigned, Origin unknown, Early 16th century (Oxford, MHS) |
Astrolabe, Unsigned, Origin unknown, Late 14th century ? (Oxford, MHS) |
Equinoctial Dial, Unsigned, Origin unknown, 15th century ? (Oxford, MHS) |
Gunner's Sight And Level, Unsigned, Origin unknown, 16th century (Firenze, IMSS) |
Horizontal Dial, Unsigned, Origin unknown, circa 1500 ? (Oxford, MHS) |
Measuring Rod, Unsigned, Origin unknown, 15th century (London, BM) |
Navicula Dial, Unsigned, Origin unknown, 15th century ? (Oxford, MHS) |
Polyhedral Dial, Unsigned, Origin unknown, Date unknown (Oxford, MHS) |
Quadrant, Unsigned, Origin unknown, Late 15th century ? (Oxford, MHS) |
Quadrant, Unsigned, Origin unknown, Date; place Undated (London, BM) |
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