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explosive safety certificate (Must obtain&maintain Level 1 Explosive Safety Certificate –  usajobs.gov Alexander Demidov) | |||
| explosion proof certificate | |||
| ex-GOST-R certificate (MichaelBurov); ex-certificate (MichaelBurov); GOST R Ex-Proof Certificate of Conformity (MichaelBurov); GOST R Ex-Proof Certificate (MichaelBurov); explosion-proof certificate (MichaelBurov); Explosion-Proof Certificate of Conformity (MichaelBurov) | |||
| сертификат взрывобезопасности: 10 do fraz, 3 tematyki |
| Bezpieczeństwo i higiena pracy | 1 |
| Systemy bezpieczeństwa | 7 |
| Technika i technologia | 2 |