Referenziert von|
| US4518274 | 22. Aug. 1983 | 21. Mai 1985 | | Pen with built-in illumination | | US4866818 | 19. Dez. 1988 | 19. Sept. 1989 | | Pinch clip | | US7101103 | 3. Mai 2005 | 5. Sept. 2006 | | Illuminated writing instrument with magnetic retainer clip | | US7575334 | 27. Febr. 2007 | 18. Aug. 2009 | | Chalk holding device with light |
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