1980.3.3 – Before the Civil War, slaves were not allowed to receive patents, but after emancipation, many inventors were able to take credit for their own work.  This patent model of an improved screw press was made by Peter R. Campbell who was a former slave of Joseph Davis.  Born into slavery in 1841, Campbell continued to live at Hurricane Plantation, Davis Bend in Warren County after the war and was awarded the patent on April 1, 1879.

Wooden screw press patent model.