I.B.M.(International Business Machine)の従業員聴力及び騒音分析について

抄録

Hearing test was done on I.B.M. operators togather with the analysis of noise of four kinds of the machines.
In hearing test, so-called C5-dip was detected only in the operators using the accounting machine, and in the noise analyzed a characteristic spectrum specific for the accounting machine was obtained.
It has thus been concluded that, as far as the I.B.M. was concerned, only the noise of accounting machine may induce a professional deafess while that of the others may be of no signficance as the couse of deafness.