|
| US4736435 | 13 Ago 1985 | 5 Abr 1988 | Sony Corporation | Ear piece transducer |
| US4828777 | 13 May 1987 | 9 May 1989 | Siemens Aktiengesellschaft | Method and apparatus for the manufacture of an otoplastic shell |
| US4834927 | 13 May 1987 | 30 May 1989 | Siemens Aktiengesellschaft | Method and apparatus for producing an ear impression |
| US5781637 | 4 Dic 1996 | 14 Jul 1998 | Resound Corporation | Method for fabricating a hearing aid faceplate and a faceplate produced thereby |