| Number | Name | Date | Kind |
|---|---|---|---|
| 5321580 | Hosoi et al. | Jun 1994 | |
| 5325491 | Fasig | Jun 1994 | |
| 5386567 | Lien et al. | Jan 1995 | |
| 5411416 | Balon et al. | May 1995 | |
| 5592362 | Ohgami et al. | Jan 1997 |
| Entry |
|---|
| Western Telematic, Inc., Mar. 1988 Product Catalog, Data Broadcasting Unit, p. 8. |