Hänvisningar finns i följande patent|
| US4259566 | 4 jan 1978 | 31 mar 1981 | Sharp Kabushiki Kaisha | Hair waving applicance having plural independently temperature controllable electric heaters | | US5203357 | 4 okt 1991 | 20 apr 1993 | | Perming method and device | | US5218908 | 18 aug 1992 | 15 jun 1993 | | Method for curing an ink design on a cap |
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