Number | Date | Country | Kind |
---|---|---|---|
55/1308 | Jan 1980 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
3662247 | Schieman | May 1972 |
Number | Date | Country |
---|---|---|
53-47806 | Jun 1978 | JPX |
1380730 | Jan 1975 | GBX |
Entry |
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Proceedings of the IEE, vol. 122, No. 11, pp. 1279-1285, Nov. 1975. |
IEEE Transactions on Industrial Electr. and Control Instrum., vol. IECI-27, No. 3, pp. 201-207, Aug. 1980. |