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process for bewehren, long, gekruemmter hohlkoerper, e.g., in the manner of rohrboegen, wendelfoermiges wrapping of the hohlkoerpers with a strip of thermoplastic material, e.g. plastic
process for bewehren, long, gekruemmter hohlkoerper, e.g., in the manner of rohrboegen, wendelfoermiges wrapping of the hohlkoerpers with a strip of thermoplastic material, e.g. plastic
