The support panel has a first sheet of paper (2,2') which can be printed and a sheet of plastics material (3,3'). The sheets can be fixed together so that the paper sheet can be tensioned over its entire surface by the sheet of plastics, without deformation by moister. The paper sheet can receive printing on the side opposite to the plastics sheet. There can be a second sheet of paper (8') which is fixed to the plastics sheet so that the second sheet can be tensioned over its entire surface. The second paper sheet can be fixed to the other side of the plastics sheet from the first.
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