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In page Chubb detector lock:
"A convict aboard one of the prison hulks in Portsmouth Docks was given the Chubb lock with a promise of a free pardon from the Government and £100 from Jeremiah if he could pick the lock. The convict, who was a locksmith by trade and had successfully picked every lock he had been presented with, was confident he could do the same with the detector lock. After two or three months of trying he was forced to admit defeat.[5][6]
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