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| Number | Date | Country |
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| 598250 B2 | Jun 1990 | AU |
| 535518 | Jan 1957 | CA |
| 6 603 758 | Jul 1969 | DE |
| DT 27 02 539 A1 | Jan 1977 | DE |
| 3336486 A1 | Apr 1984 | DE |
| 8 590 143 U | Oct 1985 | DE |
| 0 0288 929 A2 | May 1981 | EP |
| 0 098 939 A2 | Jan 1984 | EP |
| 0 114 617 A2 | Aug 1984 | EP |
| 0 063 599 | Jun 1986 | EP |
| 0 230 323 B1 | Jul 1987 | EP |
| 0 236 871 A2 | Sep 1987 | EP |
| 0 269 496 A2 | Jun 1988 | EP |
| 0 488 609 A1 | Jun 1992 | EP |
| 0 559 757 B1 | Sep 1993 | EP |
| 998148 | Jul 1965 | GB |
| 1058636 | Feb 1967 | GB |
| 1 290 474 | Sep 1972 | GB |
| 1317315 | May 1973 | GB |
| 2 063 075 | Jun 1981 | GB |
| 2 092 991 | Aug 1982 | GB |
| 2 104 393 | Mar 1983 | GB |
| 2 191 032 | Dec 1987 | GB |
| 2 195 544 | Apr 1988 | GB |
| WO 8602275 | Apr 1986 | WO |
| WO 8704354 | Aug 1987 | WO |
| WO 9010470 | Sep 1990 | WO |
| WO 9106334 | May 1991 | WO |
| WO 9207600 | May 1992 | WO |
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| WO 9215353 | Sep 1992 | WO |
| WO 9217231 | Oct 1992 | WO |
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| WO 9534874 | Dec 1995 | WO |
| WO 9616687 | Jun 1996 | WO |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 09/073275 | May 1998 | US |
| Child | 29/120588 | US |