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| Ritzversuch m | |||
| Kratzprobe f | |||
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| Ritzhärteprüfung f | |||
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| Kratzprobe f | |||
| Ritzhärteprüfung f | |||
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| Kratzprobe f | |||
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| Bleistifthärtemessung f (при помощи карандашей различной твёрдости) | |||
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испытание на твёрдость царапанием : 3 phrases in 3 subjects |
| Oil / petroleum | 1 |
| Silicate industry | 1 |
| Technology | 1 |
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