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in subjects: "water heaters"  
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Hot Water Heating System

Description: Patent for an improvement to open fire water heating systems in buildings.
Date: January 12, 1917
Creator: McChesney, Louis P.
Partner: UNT Libraries Government Documents Department

Condenser.

Description: Patent for a condenser for a hot water heater for use in homes.
Date: October 8, 1907
Creator: Nenninger, Oscar Alfred
Partner: UNT Libraries Government Documents Department
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