Number | Name | Date | Kind |
---|---|---|---|
2887546 | Hatfield et al. | May 1959 | |
3569648 | De Meyer | Mar 1971 | |
4594487 | Grassl | Jun 1986 | |
4791254 | Polverari | Dec 1988 | |
4827092 | Kobold | May 1989 |
Number | Date | Country |
---|---|---|
1186300 | Apr 1970 | GBX |
Entry |
---|
Sika Catalog, pp. 1-12, dated Apr. 1991. |
W. E. Anderson Div., Dwyer Instruments, Inc., Catalog No. V6, published prior to 1990 (Model V6). |