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Electric Motor.

Description: Patent for an electric motor that operates "with equal efficiency on either direct or alternating current" (lines 10-11).
Date: May 4, 1915
Creator: Adams, Homer E.
Partner: UNT Libraries Government Documents Department

Dental Tool

Description: Patent for a series of dental cleaning tools to remove deposits from teeth and smooth rough surfaces. This design inflicts minimal damage to the gum tissue while both a guide and blade are in contact with the tooth.
Date: May 4, 1915
Creator: Carr, Cassius M.
Partner: UNT Libraries Government Documents Department
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