Rhif Cyf AmgGARTHA/469
TeitlLetter: E.J. Locke, Telephone Manager of the Chester Telephone Area, Telephone House, Tower Wharf, Chester, to "Subscriber", informing him of the introduction of Subscriber Trunk Dialling on 10 August 1972, enclosing explanatory leaflets [now lost], and a sticker for the telephone.
Dyddiad1972
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