Number | Name | Date | Kind |
---|---|---|---|
3763217 | Brill | Oct 1973 | |
3919279 | Rosenthal et al. | Nov 1975 | |
3962302 | Rosenthal et al. | Jun 1976 | |
4081472 | Tsumura et al. | Mar 1978 |
Number | Date | Country |
---|---|---|
52-19624 | Feb 1977 | JPX |
Entry |
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