
    394 A.2d 630
    Valentine et al., Appellants, v. John Deere Industrial Equipment Company, et al.
    
      Argued June 12, 1978.
    Daniel M. Jaffe, for appellants; William H. Bradbury, III, for appellee, Deere Equipment Co.; No appearance entered nor brief submitted for appellees, Yoders.
   Judgment affirmed.  