SHEETROCK DOUBLE W ALL The double wall system consists of two layers of 3A" gypsum wallboard laminated together on the job.

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0OTE: Strict adherence to the above procedures should minimize exposures to employee during brake and cluth servicing.

Bulletin Bo. k -2- &/22/B3 I fibers witbin the lung.

Table 8a The number and category of parenchymal X-ray abnormalities according to work activity Normal pleura Profusion of sma 11 irregular opacities Type of work activity Normal.

65 In this study valid pulmonary function tests exist for 163 nonsmokers in other than the non-mechanic garage group.