VanOsdol, John. Fail Save Shut Off Valve for Filtering Systems Employing Candle Filters, patent, January 3, 2006; (https://digital.library.unt.edu/ark:/67531/metadc877250/m1/1/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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