Letchworth, Hertfordshire

British Tabulating Machine (BTM) had a factory in Letchworth, which built several machines for Bletchley Park including copies of the Polish Bombes and of the Enigma machines.

To see an Ordnance Survey map click at THIS LINK

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An extract from The Mathematical Gazetteer of the British Isles created by David Singmaster

The original site is at THIS LINK