Recreational diving services. Requirements for the conduct of snorkelling excursions Ingestion-build-135476 The main component of the

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This document provides guidelines for the essential specification characteristics of raw optical glass in order to improve communication between glass suppliers and optical element manufacturers

Recreational diving services. Requirements for the conduct of snorkelling excursions Ingestion-build-135476 The main component of the1 Scope This International Standard specifies minimum requirements for service providers offering supervised recreational snorkelling excursions. This International Standard applies to activities that will include participants being taken into an open water environment. It does not apply to activities that are exclusively conducted in a confined water environment, e. g. pools. This International Standard also specifies particular conditions under