Internal service manuals that differ from public documentation, engineering change notices, the warranty and failure database, training materials used only for dealers under contract, and any patents or confidentiality policies covering the designs.
Let dated company records carry the claim
The strongest evidence exists before anyone thinks of a petition. Internal service procedures marked confidential and issued to dealers only under agreement, engineering change notices showing how the company's designs evolved, a warranty database recording failure modes and the fixes developed for them, and dealer-training decks that name the company's own components all show that the knowledge belongs to the company and is not available from a trade school or a competitor. For the specialist, add the change notices he initiated, service bulletins he wrote, warranty cases he resolved and training sessions he delivered, each dated.
Provide certified English translations for French records. Write a technical statement that cites these documents by title and date rather than describing his expertise in general terms. Do not manufacture a manual for the petition; an officer can ask when it was written and who has used it.