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locking washer : 53 phrases in 13 subjects |
| Architecture | 1 |
| Automobiles | 15 |
| Aviation | 2 |
| Chemistry | 1 |
| Compressors | 2 |
| Construction | 1 |
| Drilling | 1 |
| Electric machinery | 4 |
| Hydroelectric power stations | 3 |
| Metallurgy | 1 |
| Nautical | 1 |
| Technology | 20 |
| Wind Energy | 1 |
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