 His thesis is, that Henry Goebel got the knowledge when working for the "American Electric Light Co." in 1881 and was not busy with incandescent lamps before.A philological analysis of all affidavits of the "Goebel-Defense" manifested numerous contradictions and improbabilities.This and the lack of independent sources in the archives to confirm claims of Henry Goebel support the thesis, the "Goebel-Defense" was fraudulent.