Number | Date | Country | Kind |
---|---|---|---|
2754420 | Dec 1977 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
2409672 | Fischer et al. | Oct 1946 | |
2769492 | Ostergren | Nov 1956 | |
3495893 | Geusic et al. | Feb 1970 | |
3524354 | Frank et al. | Aug 1970 | |
3675030 | Tanenhaus | Jul 1972 | |
3695749 | Stapleton | Oct 1972 | |
3830568 | Allen | Aug 1974 | |
3865487 | Andermo | Feb 1975 | |
3989378 | Heitmann et al. | Nov 1976 | |
4155647 | Michel | May 1979 |
Number | Date | Country |
---|---|---|
2163234 | Jun 1973 | DEX |
2610708 | Sep 1978 | DEX |
2259371 | Aug 1975 | FRX |
Entry |
---|
Jenkins et al., "Fundamentals of Optics", 3rd Ed., McGraw-Hill, 1957, pp. 239-240. |