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| Filter mit Steilkante am kurzwelligen Ende (optical materials which are transparent throughout the ultraviolet region down to their absorption edges, below which they are opaque); Filtergläser mit kurzwelliger Grenzwellenlänge (optical materials which are transparent throughout the ultraviolet region down to their absorption edges, below which they are opaque) | |||
| short -wavelength cut-off filters: 3 phrases in 1 subject |
| Optics branch of physics | 3 |
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