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Kif
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PPR
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1673
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1721
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1735
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1747
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1782
1782
1782
John Arnold
applies the cylindrical
balance spring
for patent. It makes a watch more
isochronous
thanks to two
Phillips terminal curve
s.
←
1781
|
1783
→
Year
1782.txt
· Last modified: 27.04.2023 15:23 by
gerdlothar
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