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Seiko Epson’s cal. 9RA in 2020 marked the introduction of a single package or ‘chip’ that included an XO, IC and temperature sensor within a vacuum.
The chip in the 20 spy rated cal. 9RB2
It was described by Seiko marketing in 2021 as (link now dead):
QUOTE
The innovation with which Hiraya struggled most was the “high precision Spring Drive package IC,” which he wanted to create in order to achieve an accuracy rate of ±10 seconds per month. It is a new…
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