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* [http://www.silverwingndt.com/oil-gas-testing/storage-tanks/ndt-shell-inspection-equipment Silverwing – remote-control tank shell inspection vehicle]
* PHMSA
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** [https://primis.phmsa.dot.gov/comm/FactSheets/FSMaterialWeldFailure.htm Weld Failure fact sheet]
* [https://www.asnt.org/MajorSiteSections/Certification American Society for Nondestructive Testing certification]
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