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Abbreviations

WA = Western Approaches Liverpool War Museum

TNMOC = The National Museum of Computing Bletchley Park

NTKC = National Telephone Kiosk Collection

DDA = Digital Document Archive

Some documents in the DDA are available to view.

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267

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STORAGE indicates item is in our Shropshire storage facility

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267

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STORAGE

GPO letter to customers Aug 1959. Instructions on Subscriber Trunk Dialling. Original paper and PDF in DDA