Number | Date | Country | Kind |
---|---|---|---|
2936609 | Sep 1979 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
4022826 | Lohmar et al. | May 1977 | |
4042888 | Ohorodnik et al. | Dec 1977 | |
4101573 | Gehrmann et al. | Jul 1978 | |
4104304 | Schafer et al. | Aug 1978 |
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