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| Imre Hegedüs (Hungary) 1982 |
Kalle Kirsiaed (Estonia) alates 1982 |
Hartmut Wiesner (Germany) 1988 |
Heike Hopp (Germany) 1988 |
Olaf Hopp (Germany) 1988 |
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| Henn-Jüri Uibopuu (Austria) 1990 |
Kristi and Aadu Allpere (Austria, USA) 1990, 1992, 1996 |
Bard Gaarder (Norway) 1991 |
Mats Rosenlund (Sweden) 1991 |
Jean Chaumien (France) 1992 |
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| Serge Vernet (France) 1992, 1994, 1998 |
George McQuitty (Scotland) 1993 |
Herman Stok (Holland) 1993, 1997, 2004 |
Daniel Eritja (Spain) 1994 |
Gianni Catania (Italy) 1995 |
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| Matthias Gfeller (Switzerland) 1995 |
Glenn McClelland (USA) 1996, 2000 |
Tiina and Henn Liiv (USA) 1996 |
Harry Männil (Venezuela) 2000 |
Leena and Karl Treffner (Australia) 2001 |
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