| http://www.w3.org/ns/prov#value | - int, 1998), at least25,000 workers were exposed to different types of chemicals (petroleum products,nitric and lead compounds, benzene and its derivates, manganese, nickel, phenolsetc.) and 22,000 workers were exposed to different types of aerosols (organic dust,welding aerosols, oil-shale dust, mineral fibres, dust of abrasive materials, etc.)Exposure to a chemical agent is typically the contact
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