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Acute Inhalation ToxicityArsine PoisoningIndustrial WorkersIndustrial HealthBeryllium SulfateLead Absorptionthe Enhancing EffectIndustrial MedicineEpidemiologic StudiesPrivate InsuranceChronic ToxicityMedical CareSulfur HexachlorideAcute ToxicityChemical Air PollutionCarbon Tetrachloride PoisoningCarbon Black IndustryCadmium SulfoselenideSulfur PentafluorideInhibition of Cholinesterase