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| Number | Date | Country |
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| 990506 | Jun 1976 | CAX |
| 2014525 | Oct 1991 | CAX |
| 2020206 | Dec 1991 | CAX |
| 0 658 447 | Jun 1995 | EPX |
| 1 493 516 | Jul 1967 | FRX |
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| 29 04 194 | Jun 1979 | DEX |
| 51-59515 | May 1976 | JPX |
| 57-126624 | Aug 1982 | JPX |
| 60-220729 | Nov 1985 | JPX |
| 5-261802 | Oct 1993 | JPX |
| 1107401 | Sep 1964 | GBX |
| 1161991 | Aug 1969 | GBX |
| 1 454 786 | Nov 1976 | GBX |
| 1 572 324 | Jul 1980 | GBX |
| 1572324 | Jul 1980 | GBX |
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| WO 8907530 | Aug 1989 | WOX |
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| Entry |
|---|
| PCT Search Report--PCT/CA96/00176. |
| PCT Search Report--PCT/CA97/00313. |
| PCT Search Report--PCT/CA97/00464. |