Spectacle lenses. Specification for the presentation of prescriptions and prescription orders for ophthalmic lenses
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Spectacle lenses-Specification for single-vision and multifocal semi-finished lens blanks
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Spectacle lenses-Specifications for progressive power semi-finished lens blanks
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Specification for simple smoke alarms and alarm metering devices
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Recommendations for the construction of simple smoke viewers
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Recommendations for the construction of simple smoke viewers
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Notes of the use of Ringelmann and miniature smoke charts. The calibration of instruments in Ringelmann number
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