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| abrasive ink; abrasiveness of ink | |||
| 研 墨: 18 phrases in 8 subjects |
| Earth sciences | 10 |
| General | 1 |
| Geology | 1 |
| Mining | 1 |
| Name of organization | 1 |
| Polygraphy | 1 |
| Russian language | 1 |
| Technology | 2 |
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