Public domain
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
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Credit lineTulsa, 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 obstruct. 1942-01-01. Vachon, John. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.