Number | Date | Country | Kind |
---|---|---|---|
8004696 | Aug 1980 | NLX | |
8100361 | Jan 1981 | NLX |
Number | Name | Date | Kind |
---|---|---|---|
4058836 | Drewery | Nov 1977 | |
4223340 | Bingham et al. | Sep 1980 | |
4291333 | Warnock et al. | Sep 1981 |
Entry |
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SMPTE Journal, vol. 87, No. 3, pp. 129-133, Mar. 1978. |