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ISO 2768-2-1989
General tolerances -- Part 2: Geometrical tolerances for features without individual tolerance indications
适用范围：This part is intended to simplify drawing indications and specifies general tolerances in three tolerance classes. It mainly applies to features which are produced by removal of material. It contains tour tables and an informative annex A with regard to concepts behind general tolerancing of dimensions, as well as an informative annex B with further information.
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