Nearly gave up when it became an ad for “AnyDesk” – but beware, from hard experience! That is a genuine system, by a German company, and intended for company IT system managers; but has been highjacked by the criminal fraternity to use as an eavesdropper.
That was an ingenious and impressive system, those pneumatically-synchronised clocks. I’d no idea it had even existed, and I wonder if other cities had similar.