ASTM B491M-88Withdrawn Standard: ASTM B491M-88 Specification for Aluminum and Aluminum-Alloy Extruded Round Tubes for General Purpose Applications (Metric) (Withdrawn 1990)WITHDRAWN, REPLACED BY B491/B491M There is no PDF download available at this time, however you may purchase a copy of this document from Global Engineering Documents (Email: globalcustomerservice@ihs.com; Phone: 800-854-7179 or 303-397-7956).
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