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| Number | Title | Issue Date |
| 4013870 | Terminal block mounting for a plug-in surface heating unit A plug-in surface heating unit assembly for use in the cooktop of an electric range. The heating unit is a metal sheathed electrical resistance heating element in spiral form with radial, outwardly directed terminal portions in close formation. The invent... | 03/22/1977 |
| 3931495 | Electric heating units The heating unit is particularly adapted for a stove panel and the like, and comprises a pan adapted to be supported on the panel, the pan having an opening in its side wall. A sheathed electric heating element has an active heating portion formed into a ... | 01/06/1976 |
