Patent Grant
D431428
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| Number | Date | Country |
|---|---|---|
| 0 306 461 A1 | Mar 1989 | EPX |
| 0 421 721 A2 | Oct 1991 | EPX |
| 2 031 316 | Nov 1982 | GBX |
| 2 053 438 | Apr 1983 | GBX |
| 2 272 967 | Jun 1996 | GBX |
