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Among regular doctors in the 1880s and 1890s, the most popular theories of cancer held that inevitably it was "excited," as Sir Herbert Snow said, by "som continued mechanical irritant.
The Division of Occupational Safety and Health, California Department of Industrial Relations (CAL-OSHA); "Fibrous Glass is a mechanical irritant.
The Occupational Safety & Health Administration requires employers to provide eye and face protection to guard against chemical, environmental, radiological or mechanical irritants or hazards.