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Can confirm, was quiet and sat in an open room with other workstations around with no extra fans, cooling, etc. But, it's administered with a CLI computer hooked up, so not sure it is truly 'electromechanical'.

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That's from the 80s or 90s then

...Or a retrofit from that period?

No, you don't go from 60s era tech to 90s era in phones without s forklift. Moving from electromechanical to stores program control is a sea change.

It's like going from Hollerith card based tabulators to a System/360

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