
    470 A.2d 1022
    Schaffer, Appellant, v. Mack Trucks, Inc.
    Petition for Allowance of Appeal Denied May 2, 1984.
    Argued October 11, 1983.
    Donald H. Lipson, for appellant; Wilbur C. Creveling, Jr., for appellee.
    Before SPAETH, President Judge, and MONTEMURO and POPOVICH, JJ.
   Order affirmed.  