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Optics and optical instruments. Contact lenses. Determination of the thickness. Hydrogel contact lenses.

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Admixtures for concrete, mortar and grout. Concrete admixtures. Definitions and requirements.

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Admixtures for concrete, mortar and grout. Concrete admixtures. Definitions,requirements, conformity, marking and labelling.

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Admixtures for concrete, mortar and grout. Admixtures for masonry mortar. Definitions, requirements, conformity, marking and labelling.

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Admixtures for concrete, mortar and grout. Admixtures for grout for prestressing tendons. Definitions, requirements and conformity.

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Admixtures for concrete, mortar and grout. Admixtures for grout for prestressing tendons. Definitions, requirements, conformity, marking and labelling.

WITHDRAWN published on 24.11.2004