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value of the sphere diameter, predefined by the manufacturer, which is only theoretical, tootja poolt eelnevalt määratletud kera läbimõõdu väärtus, mis on sisuliselt teoreetiline
võrdluseesmärgil kehtestatud torude süsteemi komponentide tähtnumbriline tähistusviis, alphanumeric designation of size for components of a pipework system, which is used for reference purposes
