From 30 Nov 2017

On 24.11.2017 NB Key Diffusion raised the level of professional qualification of Inspectors Venelin Filipov, M.Mech. Eng., and Georgi Kolev, Eng., in methods VT and LT, respectively. The inspectors defended certification in Non-destructive Testing, Level 3 and became members of the BULGARIAN SOCIETY FOR NON-DESTRUCTIVE TESTING.

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