Photo de stock - This historical 1947 photograph was provided by the Center for Disease Control´s CDC, National Institute for Occupational Safety and Health NIOSH. It depicted an indoor array of combustion engines that were in the process of being performance tested at the Pacific Car & Foundry Co., Renton, Washington. The exhaust produced by these engines had to be removed through a ventilation system, to which each engine was engaged by way of corregated hoses connecting each engines block manifold to the

Photo de stock: This historical 1947 photograph was provided by the Center for Disease Control's CDC, National Institute for Occupational Safety and Health NIOSH.

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