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| D292881 | Thompson | Nov 1987 | |
| D330429 | Lewis et al. | Oct 1992 | |
| D347479 | Hansen et al. | May 1994 | |
| D358660 | Swift | May 1995 | |
| 3190731 | Weiskoff | Jun 1965 | |
| 3537794 | Louder | Nov 1970 | |
| 3849256 | Linder | Nov 1974 | |
| 4046138 | Libman | Sep 1977 | |
| 4785953 | Buchholz et al. | Nov 1988 | |
| 4873193 | Jensen et al. | Oct 1989 | |
| 5104807 | Mitsumaki et al. | Apr 1992 | |
| 5624554 | Faulkner et al. | Apr 1997 |
| Number | Date | Country |
|---|---|---|
| 0410645A2 | Jan 1991 | EPX |
| 0410645A3 | Jan 1991 | EPX |
| 0435481A2 | Jul 1991 | EPX |
| 0435481A3 | Jul 1991 | EPX |
| 0502638 | Sep 1992 | EPX |
| 1573224 | Jul 1969 | FRX |
| 1428777 | Mar 1973 | GBX |
| Entry |
|---|
| Patent Abstracts of Japan vol. 16 No. 225 (P-1360) (5268) May 26 1992. |