
Hand and machine-operated circular screwing dies for parallel pipe threads, G series (ISO 4231:1987); german version EN 24231:1989
出版:German Institute for Standardisation (Deutsches Institut für Normung)

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Hand and machine-operated circular screwing dies for parallel pipe threads, G series (ISO 4231:1987); german version EN 24231:1989
出版:German Institute for Standardisation (Deutsches Institut für Normung)
专家解读视频