Two-thread chainstitch

This stitch formation has a row of stitch type 504 plus and extra row of stitch type 401 as described above. This stitch is produced on one machine and has a dual role of providing neatness on the edge with the 504 stitch whilst at the same time providing great strength to the seam with the two-thread chainstitch 401. An example of this stitch and its appearance on the seam is given in Figure 6.29. 

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