Number | Date | Country | Kind |
---|---|---|---|
4014931 | May 1990 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
3528011 | Anderson | Sep 1970 | |
4866737 | Seifried | Sep 1989 |
Number | Date | Country |
---|---|---|
3717886 | Dec 1988 | DEX |
Entry |
---|
Jahn, W. S.: "Elektrisch Messen, . . . "; R. Pflaum Verlag Munchen, 1964; s. 51-53. |