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Laser Safety Sign Changes Cause Confusion

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In 1969 the U.S. Department of Labor, seeing the growth of laser applications in industry, the military, research and development labs, and universities, asked the American National Standards Institute (ANSI) to oversee the development of a standard ensuring their safe use. The standard aimed to provide guidance for individuals who work with high-power Class 3B and Class 4 lasers and laser systems, and to protect employers, facilities and personnel from beam hazards and nonbeam hazards such as exposure to hazardous gases, laser dyes and contaminants. Sample ANSI Z535.2 Compliant Class 4...Read full article

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