File:Sewing machine stitch upper thread tension regulator.jpg
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![File:Sewing machine stitch upper thread tension regulator.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b2/Sewing_machine_stitch_upper_thread_tension_regulator.jpg/449px-Sewing_machine_stitch_upper_thread_tension_regulator.jpg?20120809141544)
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