Number | Date | Country | Kind |
---|---|---|---|
2826380 | Jun 1978 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
2114325 | Wilkinson | Apr 1938 | |
2123830 | Groesbeck | Jul 1938 | |
2842610 | Crosfield et al. | Jul 1958 | |
2971841 | Moore | Feb 1961 | |
3144333 | Waldherr | Aug 1964 | |
3488190 | Smith | Jan 1970 | |
3663221 | Higgins et al. | May 1972 | |
3745037 | Bowker | Jul 1973 | |
3947105 | Smith | Mar 1976 | |
4057326 | Knop | Nov 1977 | |
4159164 | Dammann | Jun 1979 |
Number | Date | Country |
---|---|---|
940622 | Mar 1956 | DEX |
1921460 | Apr 1970 | DEX |
2703160 | Jul 1977 | DEX |
Entry |
---|
Hennig, Siemens Zeitschrift, vol. 49, No. 8, pp. 522-527, (1975). |
Gale, SMPTE Journal, Jan. 1978, pp. 6-8. |
Knop, Optics Communications, vol. 18, pp. 298-303, Aug. 1976. |