|
| US3952138 | 16 oct. 1974 | 20 avr. 1976 | Ishikawajima-Harima Jukogyo Kabushiki Kaisha | Power control system for electric arc or refining furnace electrically directly coupled to independent power generating unit or units |
| US4032740 | 7 avr. 1975 | 28 juin 1977 | Illinois Tool Works Inc. | Two-level temperature control for induction heating |
| US4134005 | 18 janv. 1977 | 9 janv. 1979 | Keramisch Instituut Haarlem, B.V. | Method and device for controlling the temperature variation in a potter's oven |
| US4525665 | 6 août 1982 | 25 juin 1985 | | Induction furnace monitor |
| US4612498 | 12 avr. 1985 | 16 sept. 1986 | | Induction furnace fault locator |
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