DIN VDE 0720 Specifications for electric cooking and heating appliances for domestic and similar purposes; General requirements; Amendment to VDE 0720 Part 1/2.72
DVS 2208-1-1983 Machinery and equipment for the welding of thermoplastics; heated-tool welding
DVS 2207-25-1988 history
1989DVS 2207-25-1989 Welding of thermoplastics - Heated tool butt welding - Welding of casements sections made from PVC-U
1988DVS 2207-25-1988 Welding of thermoplastics; butt welding; welding of PVC-U window profiles