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Fan Attachment for Dental Engines

Description: Patent for a fan attachment for dental engines. Illustration included.
Date: January 3, 1911
Creator: Frisbie, Jonathan S.
Partner: UNT Libraries Government Documents Department

Sash Balance and Lock

Description: Patent for a spring balance and lock for window sashes. Illustrations included.
Date: April 18, 1911
Creator: Huffman, Thadeus E.
Partner: UNT Libraries Government Documents Department
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