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| Rockwell's hardness tester | |||
| Rockwell hardness meter | |||
| Rockwell hardness tester | |||
| Rockwell apparatus; Rockwell hardometer; Rockwell tester | |||
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洛氏硬度 计 : 7 phrases in 3 subjects |
| Metallurgy | 4 |
| Oil / petroleum | 2 |
| Technology | 1 |
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