Robert Barron was an

English English usually refers to: * English language * English people English may also refer to: Peoples, culture, and language * ''English'', an adjective for something of, from, or related to England ** English national ...

locksmith notable for his invention of the double–acting tumbler lock in 1774, patented the same year. At the time of the patent, he lived in the city of

London London is the capital and List of urban areas in the United Kingdom, largest city of England and the United Kingdom, with a population of just under 9 million. It stands on the River Thames in south-east England at the head of a estuary dow ...

References

Locksmiths Year of birth missing Year of death missing Place of birth missing 18th-century inventors {{England-engineer-stub