What happened in the 1880s?
🗝️ Chubb Locks Patents Detector Lock (1882): Developments in security technology.
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Further Reading
Chubb Detector Lock - Antique Box Guide (antiquebox.org)
Chubb detector lock - Wikipedia (wikipedia.org)
A Gazetteer of Lock and Key Makers (co.uk)
The Chubb Detector Lock Legacy: History, Evolution, And More (lowratelocksmith.com)
CHUBB AND SON LIMITED {LOCKSMITHS AND SAFE ... (gov.uk)
Object : Patent locks and keys, Randolph Douglas - BBC (co.uk)
Chubb - Express & Star photo archive (co.uk)
Chubb Safes History (co.uk)