This invention relates to fastening sheets of deformable material together and more particularly to clinch joints and {TAIL ~ methods} and apparatus for forming clinch joints of both the leak proof and {HEAD ~ lanced type joints} 
This invention relates to fastening sheets of deformable material together and more particularly to clinch joints and { TAIL ~ methods } and apparatus for forming clinch joints of both the leak proof and { HEAD ~ lanced type joints }
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