Number | Date | Country | Kind |
---|---|---|---|
3049607 | Dec 1980 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
3988571 | Blair et al. | Oct 1976 | |
4027142 | Paup et al. | May 1977 | |
4262589 | Gebhardt | Apr 1981 |
Number | Date | Country |
---|---|---|
16958 | Feb 1979 | JPX |
76475 | Jun 1980 | JPX |
Entry |
---|
"Laser Focus" Sep. 1980, pp. 28 and 29. |