In order to find, inside the same vibration syndrome, likely differences of the pathology due to the different technological features of the vibrating tools, 42 forestry workers have been compared with 168 mine workers. No significant differences have been noticed, as concerns both osteoarticular lesions and photopletismography study of peripheral blood circulation; in mine workers a prevalence of lesions of the nail-folds capillaries has been noticed, according to the authors dependent on the higher energy of the vibrations brought out boring-machines.