Patent Grant
D435640
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| Number | Date | Country |
|---|---|---|
| 0 160 168 A2 | Nov 1985 | EPX |
| 0 213 930 A2 | Mar 1987 | EPX |
| 990587 | Apr 1965 | GBX |
| 1016556 | Jan 1966 | GBX |
| 2 195 558 | Apr 1988 | GBX |
| PCTGB8500198 | Dec 1985 | WOX |
