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Ce n'est pas un travel guide

1A2 Key System Switch

1A2 Key System Switch

Letchworth Village had a full-featured Western Electric Key Telephone System, called a Private Branch Exchange or PBX in modern parlance. These are the insides. On top, line cards provide line control, dial decoding, and dial features. On the bottom racks are the power supplies.

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Lonely at Letchworth

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X-Resolution180 dpi
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