Public domain
Steel manufacture, Allegheny-Ludlum. Steel couplings such as these are used to extend short lengths of pipe for many miles. Steel piping is used to convey solutions and gases in numerous plants engaged in defense production
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineSteel manufacture, Allegheny-Ludlum. Steel couplings such as these are used to extend short lengths of pipe for many miles. Steel piping is used to convey solutions and gases in numerous plants engage. 1940-01-01. United States. Office For Emergency Management, Palmer, Alfred T.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.