У вашего броузера проблема в совместимости с HTML5
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I am demonstrating setting up a Singer Professional 5 thread serger, double chain stitch singer serger professional 5, Sew, trim and finish a seam, and much more, with our user-friendly Singer Professional 5 Thread Serger Machine. Truly top of the line, this serger has 2-3-4-5 thread stitch options of How to Cover Stitch Using a Sewing Machine