UNT Libraries Government Documents Department - 3 Matching Results

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Patent for machine to exterminate boll weevils, including illustrations. This device administers insecticide and captures damaged plants and insects.

Date: July 31, 1917

Creator: Henry, William L. & Calloway, Irven E.

Patent for a clothes-pin made of one piece of wire twisted around with a spring-clamping mechanism for holding clothes.

Date: July 9, 1907

Creator: Freeze, John A.

Patent for a self-locking door clamp for cotton presses, including illustrations.

Date: July 23, 1901

Creator: Westbrook, John Alburt