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| нижняя утяжелённая труба; нижняя утяжеленная труба | |||
| наддолотник | |||
| нижний воротник; подворотник | |||
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bottom collar : 5 phrases in 3 subjects |
| Oil / petroleum | 3 |
| Oil and gas | 1 |
| Oil and gas technology | 1 |
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