DVS 2207-3 Beiblatt 2-2005 "Welding of thermoplastics - Hot-gas string-bead welding and hot-gas welding with torch separate from filler rod of pipes, pipe components and sheets - Requirements for welding equipment and accessories" has been changed from DVS 2208-2-1978 Welding of thermoplastics; machines and equipment for hot-gas welding (not extrusion welding).
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