Letters of recommendation
 Letters of recommendation |
 Letters of recommendation |
 Letters of recommendation |
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| Helium plant "Gazprom dobycha Orenburg" |
Gas processing plant "Gazprom dobycha Orenburg " page 1 |
Gas processing plant "Gazprom dobycha Orenburg " page 2 |
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 Letters of recommendation |
 Letters of recommendation |
 Letters of recommendation |
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| "Ryazan oil refining company" | "TAIF-NK" | "Dorogobuzh" | ||
 Letters of recommendation |
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| "Оrsknefteorgsintez" | ||||
