Citada por|
| US4344346 | 29 Sep 1980 | 17 Ago 1982 | Marvin Glass & Associates | Musical light toy | | US4429607 | 30 Mar 1982 | 7 Feb 1984 | University of Pittsburgh | Light beam musical instrument | | US5451178 | 4 Mar 1993 | 19 Sep 1995 | Sony Corporation | Auditory playing device |
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