| 摘要 |
1517840 Security documents, credit cards and the like LGZ LANDIS & GYR ZUG AG 10 Nov 1976 [17 Nov 1975] 46791/76 Heading B6A The document comprises a non-thermoplastic material at least partly coated with a thermoplastic coating in which are embossed optical markings with a light-modifying relief structure, e.g. a phase hologram or a phasediffraction grating. |
