Air Traffic Control telephone systems.
Until relatively recently, control tower telephones usually consisted of a bank of push button or toggle switches for accessing direct lines and a keypad or old rotary dial for other numbers. Does anyone know which telecom companies, if any, made these items or were they generally made in-house by airport tels departments ? I have seen GPO/BT key and lamp units being used but I don't think they were that common in control towers.
Modern systems tend to be off the shelf products by the likes of Frequentis and Drake and they've largely seen off the older equipment.
The sort of thing I mean are the blue push button switches in this picture. The lever keys are for RT frequencies.
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