1. MRB - Noun
2. MRB - Verb
(manufacturing) Initialism of Material Review Board, system of recorded investigative checks done on failed components or processes to improve quality.
Initialism of Mortgage Revenue Bond.
MRB
To send a failed component through the MRB process.
Four boats returned: PT-8, PT-69, PT-70, and MRB, and Elco sent two new boats, PT-21 and PT-29. Source: Internet
The average speed results from the convert course were: Elco 77-footer (PT-21), convert; Higgins 76-footer (PT-70), convert; Higgins MRB and Philadelphia Navy Yard boat (PT-8), convert. Source: Internet