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The results of pulmonary function tests in patients with silicosis, pneumoconiosis in coal miners and arc welders, asbestosis, as well as in persons exposed to asbestos without abnormal x-ray findings of the chest, and in nonexposed healthy control persons and the development after 6 years are compared between each other and with the x-ray findings. There are significant differences between the several groups. There is no correlation (parallelism) between increase of lung function impairment and progression of x-ray findings.
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