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| nicht nachdunkelndes Glas (for use in optical systems intended for the study of radioactive materials); strahlungsunempfindliches Glas (for use in optical systems intended for the study of radioactive materials) | |||
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| nicht nachdunkelndes Glas (for use in optical systems intended for the study of radioactive materials); strahlungsunempfindliches Glas (for use in optical systems intended for the study of radioactive materials) | |||