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Improvement in Combination Locks.

Description: 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.
Partner: UNT Libraries Government Documents Department

Improvement in Ice-Machines.

Description: Patent for improvements to the construction of "of the various parts of the [ice machine], whereby the reconversion of the ether into liquid before it reaches the freezing-vessel or chamber is better assured" (para. 3).
Date: December 12, 1871
Creator: Mühl, Andrew
Partner: UNT Libraries Government Documents Department

Improvement in Railway-Car Trucks.

Description: Patent for improvements in railway car trucks.
Date: September 12, 1871
Creator: Mestier, John R.
Partner: UNT Libraries Government Documents Department
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