251. A party in possession of real evidence is required, on request, to present it to the other parties or, subject to the conditions agreed with them, to submit it to an expert; the party is also required to preserve, until the end of the trial, the real evidence or, if applicable, a suitable representation that shows its current state.
A third person holding a document relating to a dispute or in possession of real evidence is required, if so ordered by the court, to disclose it, present it to the parties, submit it to an expert or preserve it.