Joining {or sealing} of preformed parts {, e.g. welding of plastics materials}; Apparatus therefor by welding and severing {, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using a single unit having both a severing tool and a welding tool for making welds and cuts of other than simple rectilinear form}
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