supply of spring for automatic pressure modification device (el - 60 valve ) of airbrake wagons having bmbs knorr part no. 771112 or prag part no 771112 conformingto rdso specification no wd-23- bmbs - 2008 ( rev.1) aith amend. 1 of sept. 2016 and drgno. wd- 08093-s-02 alt - 3 & 08096 - s- 01 alt -.2 .
