A. Portable Blast Cleaning Machines 21 B. Hand-Operated Units Within Blast Cleaning Rooms 21 C. Hand-Operated Cabinet Type Blast Cleaning Machines 25 D. Automatic Blast Cleaning Machines 27 E. Wet Blast Cleaning Machines 27 IV. PAST HEALTH AND INDUSTRIAL ACCIDENT EXPERIENCE 31 V. EXISTING SAFETY AND HEALTH STANDARDS FOR ABRASIVE BLAST CLEANING ...