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in subjects: "water heaters"  
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Water-Cock for Water-Heaters.

Description: Patent for a water cock for a water heater that automatically drains the water heater when the main water supply is cut off.
Date: May 21, 1907
Creator: Simpson, Ray C.
Partner: UNT Libraries Government Documents Department

Auxiliary Water-Heater and Smoke-Consumer

Description: Patent for a water heater which connects to the furnace and uses the smoke and gases passing through it to heat the water in the water heater.
Date: January 21, 1908
Creator: Miles,Joseph Furnas
Partner: UNT Libraries Government Documents Department

Combined Heater and Filter

Description: Patent for a combined heater and filter. This invention is used in a dentists office to regulate the water supply for at the dentists chair. Illustration included.
Date: February 21, 1911
Creator: Gambati, Olympio F.
Partner: UNT Libraries Government Documents Department
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