Designation: B 139/B 139M –01 Standard Speci?cation for Phosphor Bronze Rod, Bar, and Shapes 1 This standard is issuedunder the ?xed designation B 139/B 139M; the number immediately following the designation indicates the year of original adoption or, in the caseof revision, the year of last revision. A number in parenthesesindicates the year of last reapproval. A superscript epsilon (e) indicates