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Improvement in Cultivators.

Description: Patent for changes in the construction of a cultivator.
Date: May 23, 1871
Creator: Walker, Leander
Partner: UNT Libraries Government Documents Department

Ladder.

Description: Patent for a ladder that will allow its prop legs to be slided longitudinally of the main ladder legs to form an extension ladder.
Date: May 23, 1912
Creator: Vierheller, Paul E.
Partner: UNT Libraries Government Documents Department
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