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Boiler Stay Bolt

Description: Patent for a boiler stay bolt. Illustration included.
Date: September 20, 1904
Creator: Peters, Joseph & Coleman, John
Partner: UNT Libraries Government Documents Department

Air-Cleaning System

Description: Patent for an air cleaning system to be used in homes. Illustrations included.
Date: April 20, 1909
Creator: Mayo, William C. & Houlehan, John
Partner: UNT Libraries Government Documents Department
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