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A licensee under paragraph (1)(a) is entitled to call on the patentee to take proceedings to prevent infringement of the patent, and if the patentee refuses or neglects to do so within two months after being so called on, the licensee may institute proceedings for infringement in his own name as though he were the patentee, making the patentee a defendant, but a patentee added as defendant is not liable for any costs unless he enters an appearance and takes part in the proceedings.