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1887, Minnesota State Board of Corrections and Charities, Biennial Report of the State Board of Corrections and Charities:
The outer, and inner entrance doors have jail locks.
1927, New York Legislative Documents - Volume 20, page 343:
To prevent this and the possibility of scandal (which could happen on trumped up charges) a grated steel door with jail lock should be placed on this doorway.
2007, Graham Pulford, High-Security Mechanical Locks: An Encyclopedic Reference, →ISBN:
Also known as jail locks, Scandinavian padlocks were made from cast components, having a malleable iron body, shackle, and key.