Number | Date | Country | Kind |
---|---|---|---|
2-182194 | Jul 1990 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
4720451 | Shuto et al. | Jan 1988 | |
4906558 | Mucke et al. | Mar 1990 | |
4952490 | Takada et al. | Aug 1990 |
Entry |
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Journal fur Signalaufzeichnurgsmaterialien, vol. 5, No. 6, Nov. 1977, Berlin, DD, (pp. 449-455). |