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See Chinese contents: GB/T 4249-2018 GB/T 4249-2018: Geometrical product specifications (GPS) -- Fundamentals -- Concepts, principles and rules
This Standard specifies the fundamental concepts, principles and rules that are valid for the creation, interpretation and application of all relevant standards, technical specifications and technical documents to product dimensions, geometrical product specifications (GPS) and inspections. This Standard is applicable to the interpretation for GPS marks on all types of drawings. Drawing referred in this Standard is a broad concept. It includes all documents that express workpiece specifications.
