|
| US4002835 | 6. Juni 1975 | 11. Jan. 1977 | | Multi-channel decoding circuit for two-channel audio systems |
| US4006306 | 10. Okt. 1975 | 1. Febr. 1977 | Yudin Industries, Inc. | Audio signal processing apparatus |
| US4074084 | 5. Nov. 1975 | 14. Febr. 1978 | | Method and apparatus for receiving sound intended for stereophonic reproduction |
| US4132859 | 2. Dez. 1977 | 2. Jan. 1979 | | Sound reproducing apparatus |
| US7477752 | 1. Nov. 2004 | 13. Jan. 2009 | Bayerische Motoren Werke Aktiengesellschaft | Loudspeaker system |
