Public domain
Untitled photo, possibly related to: Tulsa, Oklahoma. Pumping station engineer with an apparatus known variously as "pig", "go-devil" and "scraper". It is sent through the eight inch pipeline at intervals for cleaning, to remove obstructions and to detect leaks
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineUntitled photo, possibly related to: Tulsa, Oklahoma. Pumping station engineer with an apparatus known variously as "pig", "go-devil" and "scraper". It is sent through the eight inch pipeline at inter. 1942-01-01. Vachon, John. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.