Number | Date | Country | Kind |
---|---|---|---|
9818831 | Aug 1998 | GBX |
Number | Name | Date | Kind |
---|---|---|---|
4632703 | Koike et al. | Dec 1986 | |
5177200 | Kluger et al. | Jan 1993 | |
5506708 | Harrison et al. | Apr 1996 |
Number | Date | Country |
---|---|---|
0 519 395 | Dec 1992 | EPX |
844419 | Aug 1960 | GBX |
Entry |
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Houben-Weyl vol. 11/2, 23-24. |