Normally the dials are the timer for cooking time plus cooking power level dial, for defrost, medium, high, etc.
It may also have a start button to start it cooking. If not, then you place the food inside, shut the door, then rotate the timer dial to however many minutes you want.
If this does not answer your question, maybe you can take a photo of the controller and post it.
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it was made in 1967. has two dials
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