According to T 426/88
(OJ 1992, 427) a book providing general teaching in a general technical field covering the invention's specific technical field was part of the general knowledge of a specialist in that specific technical field. When books, representing common general knowledge, described a basic general technical theory or methodology and exemplified the same with specific applications in certain technical fields only, these did not limit the general scope and relevance of such disclosures so as to exclude possible applications in other fields. The appellant had argued that the book, written in German, was not a general reference book consulted by experts in that field in Great Britain. The board, however, adhered to the definition of the state of the art given in Art. 54 EPC 1973
, according to which no account was taken of the location at which the skilled person exercised his profession.