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A. W. Sherwood Abrasive Company Abrasive Products Company Abrasive Wheel Air Hygiene Foundation Andrew Fletcher ANNUAL MEETING apparatus Ass'n B. D. Saklatwalla Board of Trustees bulletin Bureau of Mines Chairman chest roentgenogram Chest roentgenography China Company Company United compensation method D. C. New York diagnostic Emery Estimated time required exposure February 9 Feldspar Corporation FOUNDATION OF AMERICA Grinding Wheel Company Grinding Wheels Corporation Harvard School Hitchins infection inhalation Johns-Manville Corporation Lesher R. R. lung Mathieson Alkali Medical Committee medico-legal Mellon Institute Mfrs Mining Company National Industrial Sand nodulation Occupational Disease Ohio Pittsburgh Owens-Illinois Glass Company Pennsylvania Hospital Philip Drinker Pittsburgh Coal Company PREVENTIVE ENGINEERING COMMITTEE Public Health Service R. R. Sayers required for research—1 research program Sanitary Manufacturing Saranac Lake Silica Company silica dust silicosis silicotic Steel Corporation tissue Toledo tuberculosis U. S. Bureau U. S. Public Health U. S. Rustless Steel University of Pennsylvania Vandiver Brown Theodore x-ray