Number | Name | Date | Kind |
---|---|---|---|
2633543 | Howatt | Mar 1953 | |
2739243 | Sheldon | Mar 1956 | |
3202824 | Yando | Aug 1965 | |
3677751 | Ohta | Jul 1972 | |
3713822 | Kiess | Jan 1973 | |
3719481 | Makino | Mar 1973 | |
3775104 | Matsumoto | Nov 1973 | |
3931446 | Murayama et al. | Jan 1976 |
Entry |
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Journal of Audio Engineering Society, 1975, p. 72. |
Xerography Dassauer & Clark, pp. 230 & 268. |