File:Control knobs of Heathkit OL-1 Oscilloscope.jpg
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![File:Control knobs of Heathkit OL-1 Oscilloscope.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c4/Control_knobs_of_Heathkit_OL-1_Oscilloscope.jpg/800px-Control_knobs_of_Heathkit_OL-1_Oscilloscope.jpg?20221230221133)
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