Re: Air Traffic Control telephone systems.
I'm not sure, but I believe that the BT Pentara PABX I was originally decommissioned from ATC at Heathrow, judging by the labels on some of the buttons on the operator's 'phone. If so, that probably gives some idea of what they had at one time.
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Mending is better than Ending (cf Brave New World by Aldous Huxley)
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