Number | Date | Country | Kind |
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2911379 | Mar 1979 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
2875645 | Keyser | Mar 1959 | |
4161862 | Hartmannsgruber et al. | Jul 1979 | |
4195389 | Schulz et al. | Apr 1980 |
Entry |
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"Textile Applications of Adjustable-Frequency Drives with Digital Ratio Control", by Edward H. Dinger, IEEE Transaction of Industry Applications, vol. IA-8, Jan.-Feb. 1972. |