Re: Air Traffic Control telephone systems.
Maybe the Pentara was used in the administrative offices rather than on the "front line" of ATC. What I have is an unadulterated CCU and featurephones - albeit with some interesting programming.
Certainly, headsets for ATCs would make sense to keep their hands free.
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Mending is better than Ending (cf Brave New World by Aldous Huxley)
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