Number | Date | Country | Kind |
---|---|---|---|
3610820 | Apr 1986 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
3162250 | Sindelar | Dec 1964 | |
4063600 | Krzes | Dec 1977 | |
4208555 | Ikeda et al. | Jun 1980 |
Number | Date | Country |
---|---|---|
2731090 | Sep 1983 | DEX |
Entry |
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"Wie Funktioniert Das?", Bibliographisches Inst., Mannheim, 1963, pp. 612, 613. |