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| Number | Title | Issue Date |
| 5787229 | Electric hot water tank with layered storage An electric hot water heater tank is fitted with a plurality of separators that divide the tank into a plurality of chambers surrounding the tank axis and extending between the top and bottom walls. The adjacent chambers communicate alternately in a direc... | 07/28/1998 |
| 5678533 | Hot water heater with separator structure A hot water heater comprises a tank having top and bottom walls and a peripheral wall having an axis, the tank being adapted to contain water at a predetermined pressure above atmospheric pressure. A separator structure is received in the tank between the... | 10/21/1997 |
