Number | Date | Country | Kind |
---|---|---|---|
3238880 | Oct 1982 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
3796943 | Nelson et al. | Mar 1974 | |
4177416 | Davis | Dec 1979 | |
4282478 | Leidich | Aug 1981 | |
4338646 | Davis et al. | Jul 1982 |
Entry |
---|
Philips Technische Rondschau 1971/72, Nr. 1. |