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Trolley-Pole Head.

Description: Patent for improvements in trolley-pole heads in which a good contact may established at all time between the wheel and the trolley-wire. Illustration is included.
Date: May 17, 1904
Creator: Dunn, Robert I. E.
Partner: UNT Libraries Government Documents Department

Plastic Base for Poles.

Description: Patent for a plastic base for poles which aims to lengthen the life of the average pole and enable the use of poles of shorter lengths.
Date: May 17, 1921
Creator: Hoyle, Millard F.
Partner: UNT Libraries Government Documents Department

Cotton-Cultivator.

Description: Patent for an improved cultivator used for tillage when the plows are not in the ground. The cultivator can also lighten the heaviness felt by the operator while the plow is being used.
Date: May 17, 1921
Creator: Barnett, James Samuel
Partner: UNT Libraries Government Documents Department

Holder for Dental X-Ray Films.

Description: Patent for dental X-Ray holders that securely hold the film in place and categorize the X-Rays into series that comprise views of the whole mouth.
Date: May 17, 1921
Creator: Martin, James Madison
Partner: UNT Libraries Government Documents Department
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