Number | Name | Date | Kind |
---|---|---|---|
3405457 | Bitzer et al. | Oct 1968 | |
3818453 | Schmidt et al. | Jun 1974 | |
4422171 | Wortley et al. | Dec 1983 | |
4480328 | Alaria et al. | Oct 1984 | |
4625308 | Kim et al. | Nov 1986 | |
4768087 | Taub et al. | Aug 1988 |
Entry |
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"The ATS-6 Health Education Telecommunication (HET) Experiment", by Janky et al., Appearing in Communications Satellite Systems: An Overview of the Technology, pp. 7-12, 1976, IEEE Press. |
"An Electronic University", by Lionel V. Baldwin, Appearing in Nov. 1984 Issue of Spectrum, pp. 108-110. |