The Director System was a system which made it possible to call subscribers at other telephone exchanges without operator intervention. It was introduced to six cities in the UK from 1922, starting with London, following the introduction of the automatic telephone exchange in the UK in 1912.
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| - The Director System was a system which made it possible to call subscribers at other telephone exchanges without operator intervention. It was introduced to six cities in the UK from 1922, starting with London, following the introduction of the automatic telephone exchange in the UK in 1912. (en)
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| - The Director System was a system which made it possible to call subscribers at other telephone exchanges without operator intervention. It was introduced to six cities in the UK from 1922, starting with London, following the introduction of the automatic telephone exchange in the UK in 1912. (en)
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| - Director telephone system (en)
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