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Improvement in Combination Locks.
Patent for improved combination locks, with a bolt that is locked or unlocked by the combination of spindles and pivoted buttons. The invention combines the spindles in to an "annular ring having letters or numbers and a series of different shaped pegs or combinations of letters or figures or both jointly" (pg 1).
Date:
September 12, 1871
Creator:
Hall, William N.
System:
The Portal to Texas History