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pendulum-type mechanical rake : 31 phrases in 9 subjects |
| Agriculture | 2 |
| Automobiles | 1 |
| Chemistry | 2 |
| Communications | 1 |
| Metallurgy | 5 |
| Rail transport | 2 |
| Shipbuilding | 2 |
| Space | 1 |
| Technology | 15 |
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