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3) Iwata, H: Comparative studies on vibration disease among chain saw, rivet gun, piston-operated tool and rotating tool operators, Jap. J. Dis. Med., 25 (4), 184-192,(1977) (in Japanese)
4) Iwata, H: Effects of rock drills on operators. Part I Vibration of rock drills and air temperature at pits, Jap. J. Ind. Health, 6, 28-36,(1968)
5) Matsumoto, T., Harada, N., Yamada, S. and Kobayashi, F.: On vibration hazards of chipping-hammer operators in an iron foundry, Jap. J. Ind. Health, 23, 51-60,(1981) (in Japanese)