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 therefore, in which case the plaintiff shall cause the notice to be advertised once in a newspaper of general circulation published in Mercer County and in the Mercer County Law Journal.
Merc. Cnty. Pa. 2205