Coal worker's pneumoconiosis (black lung illness) can range in severity from slight pulmonary dysfunction to progressive massive fibrosis leading to rising respiratory distressand cor pulmonale. It may be nonkeratinized mucosa, such as the foor of the mouth, the confrmed by a virus culture (which requires 2 to 4 days alveolar mucosa, and the buccal labial mucosa. The measured coefcients of friction compare with the results reported in Al pattern the literature
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