| Number | Name | Date | Kind |
|---|---|---|---|
| 3809101 | Shimizu | May 1974 | A |
| 3866618 | Tsukamoto | Feb 1975 | A |
| 5275181 | Rudolph | Jan 1994 | A |
| 5287863 | La Joie et al. | Feb 1994 | A |
| D373854 | Hudson | Sep 1996 | S |
| D378444 | Atkinson | Mar 1997 | S |
| 5658184 | Hoopman et al. | Aug 1997 | A |
| 5709591 | Warner et al. | Jan 1998 | A |
| 5732719 | Godbout | Mar 1998 | A |
| 5813416 | Rudolph | Sep 1998 | A |
| 6027402 | Oliver | Feb 2000 | A |
| 6062967 | Calafut et al. | May 2000 | A |
| Number | Date | Country |
|---|---|---|
| 2179248 | Mar 1987 | GB |
| Entry |
|---|
| Hong Kong Enterprise Oct. 1989, p. 517: item No. PLS-1 and PL-1.* |
| Hong Kong Enterprise Oct. 1994, p. 887: oblong file No. ER-5A. |