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in subjects: "locks"  
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Nut-Lock.

Description: Patent for a nut lock, which stops the nut from rotating.
Date: December 8, 1908
Creator: Brown, John J.
Partner: UNT Libraries Government Documents Department

Permutation-Lock.

Description: Patent for a permutation lock, which is harder to break into than the previous version.
Date: February 2, 1909
Creator: Maxfield, James R.
Partner: UNT Libraries Government Documents Department

Permutation-Lock.

Description: Patent for a permutation or combination lock for mail boxes.
Date: February 18, 1908
Creator: Maxfield, James Robert
Partner: UNT Libraries Government Documents Department
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