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Grate Bar

Description: Patent for a grate bar.Illustration included.
Date: October 18, 1910
Creator: Wilderspin, Anderson & Earnest, David C.
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

Improvement in Pruning Implements.

Description: Patent for "an improved implement for trimming hedges and for cutting and laying down hedges" (lines 8-10) with instructions and illustrations.
Date: November 18, 1879
Creator: Booker, David
Partner: UNT Libraries Government Documents Department

Hen's Nest.

Description: Patent for an automatic gate or door for a hen's nest enclosure that will swing shut to keep out intruders when a hen enters and open when the hen leaves.
Date: January 18, 1916
Creator: Buie, Daniel C.
Partner: UNT Libraries Government Documents Department
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