
    478 A.2d 85
    Mahr, et al, Appellants, v. Exxon Corp.
    Argued March 1, 1983.
    George T. McKinley, for appellants;
    Michael Quinn Davis, for appellee.
    Before CERCONE, President Judge, and CAVANAUGH and WIEAND, JJ.
   Affirm the order of the lower court.  