The notice shall in all cases be given personally or by registered or certified mail to each person entitled by law to recover damages in the action, unless the plaintiff shall file an affidavit that the identity or whereabouts of any such person is unknown to him after diligent search therefor, in which case the plaintiff shall cause the notice to be advertised one time in a newspaper of general circulation published in Jefferson County and also one time in the Jefferson County Legal Journal. Proof of such publication shall be filed in the prothonotary's office.
Jeff. Cnty. Pa. 2205