重庆某厂自1971年工艺改革后，深孔钻机床的转速加大。操作时工人双手接触振动的钻杆，在1—5年内发现该组11位工人都出现手指麻木，发冷，紫绀，苍白等雷诺氏现象（振动病），尤以冬天为甚，影响生产。另有二工人操作一台旧式 Chongqing factory since 1971 process reform, deep hole drilling machine speed increased. In the course of operation, workers exposed the vibrating drill pipe with both hands and found that 11 workers in this group experienced Raynaud’s phenomenon of numbness, chills, cyanosis and paleness (vibration sickness) in 1-5 years, especially in winter, affecting production. Another two workers operate an old style