Public domain
Aluminum casting. The heads of these heat-treated pistons must be spotted prior to Brinnell hardness testing. Young women are employed for this job by a large Midwest aluminum foundry now converted to war production. Aluminum Industries Inc., Cincinnati, Ohio
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Credit lineAluminum casting. The heads of these heat-treated pistons must be spotted prior to Brinnell hardness testing. Young women are employed for this job by a large Midwest aluminum foundry now converted to. 1942-01-01. United States. Office Of War Information, Palmer, Alfred T.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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