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“Chiswick Security”, Hackney: hackneyed device

“Chiswick Security” burglar alarm, Hackney • Another key with an initial in its handle, though much cruder than yesterday’s elegant example. The zig-zag notches on its blade suggest that, like the other keys featured so far, it is for opening a pin-tumbler cylinder lock, typical of house front doors. Inspired by 4,000-year-old wooden devices from ancient Egypt, the definitive cylinder lock was patented by Linus Yale Junior in 1861 and remains little changed to this day – a design even older than this alarm. • Spotted: Clifton Street, Hackney, London, EC2, England, 2008 • Politics: In the Labour constituency of Hackney South and Shoreditch

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