At least one switch is provided in the circuit supplying the high frequency generator through the time switch which is operated in accordance with the position and condition of the lock on the oven door. A mechanical connection is provided between levers in the locking device and the above switch, so that it is impossible to open the oven door with the radiation still switched on. Multiple switches may be used for increased safety, making it impossible for burns to be inflicted on anyone putting his hands in the oven.
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