Describes a laboratory test method for measuring the resistance of medical face masks to penetration by a splash of synthetic blood (fixed volume, horizontally projected)..
Provide a code, published by the registration authaurity of ISO 639-3, consisting of language code elements comprising three- letter identifier for the representation of languages...
Specify a method for establishing four letter language identifiers (alpha -4) and language reference name for language variants and hierarchical framework for relating them to languages, language families and language group...
It gives the general principles of language coding using the codes that are specified in the other parts of ISO 639 and their combination with pther codes..
Provides a code consisting of language code elements comprising three- letter language indentifiers for the representation of names of living and extint language families and groups...