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(11) | EP 1 136 635 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Flat support means made of ceramic material |
(57) Support means obtained by casting ceramic material comprises quadrangular plate means
(2) and border toroidal means (3), said toroidal means (3) being arranged on at least
three sides of said quadrangular plate means (2). |