House Telephone System 2 and HES 4
These were 700 type updates on the HTS 1 and HES 1 respectively. On both systems the main improvement over their predecessors was that the rows of call buttons were now arranged transversely instead of longitudinally. This meant that the basic 706 case styling only needed to be stretched forwards by 3 inches instead of 8 as previously, on the HES. This looked neater and took up less space. Otherwise, both of these systems had the same facilities as their 300 type counterparts.
Read more about this topic: GPO Telephones
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