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| Number | Title | Issue Date |
| 6816326 | Optical system with compensated spatial dispersion The optical system has a first optical element (11,17, 19, 26) and a second optical element (12, 18, 20, 27) having respective plane surfaces and cubic crystal structures, which are arranged next to each other along an optic axis (10) so that on... | 11/09/2004 |