T 0169/83 (Wall element) vom 25.03.1985

The European Patent Convention does not exclude the possibility that in the course of opposition proceedings followed by an appeal the claims of a European Patent which in accordance with Article 123(3) do not extend the protection conferred may be limited by the fact that specific features referred to in the claims are clearly shown in the drawings originally filed and are clearly, unmistakably and fully derivable from the drawings in terms of structure and function by a person skilled in the art and so relatable by him to the content of the description as a whole as to be manifestly part of the invention.