Number | Date | Country | Kind |
---|---|---|---|
50-48509 | Apr 1975 | JA | |
50-54410 | May 1975 | JA |
Number | Name | Date | Kind |
---|---|---|---|
3328528 | Darlington | Jun 1967 |
Number | Date | Country |
---|---|---|
905,838 | Sep 1962 | UK |
Entry |
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IEEE Conference on Communications, Freeny et al., "An Exploratory Terminal for Translating Between Analog Frequency Division and Digital Time Division Signals", June 1971, pp. 22-31-22-36. |