556. Inspection.

The court has power to order inspection at the instance of either party1, but it is careful to prevent such inspection being used as a means of discovering trade secrets. Where it appears that inspection by a claimant of an alleged infringing process will reveal such secrets, the order for inspection is made only where the claimant makes out a prima facie case of infringement, or where it appears that a real issue as to infringement can best be settled by inspection