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ISO 2550:1972 Textile floor coverings -- Hand-made carpets -- Determination of types of knots
standard by International Organization for Standardization, 08/01/1972
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Describes different types of knots used in manufacturing hand-made carpets. A visual method for identification of types of knots is given. Applicable to most carpets in which knots are tied by finger or by hook. Exyamples of types of knots are shown in figures.