 |
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| метод Фраша (a method to extract sulfur from underground deposits MichaelBurov) | |||
|
Frasch process : 2 a las frases, 1 temas |
| Tecnología | 2 |
|
| |||
| метод Фраша (a method to extract sulfur from underground deposits MichaelBurov) | |||
|
Frasch process : 2 a las frases, 1 temas |
| Tecnología | 2 |