
    373 A.2d 1153
    U. S. Expansion Bolt Co. v. Zifferer et al., Appellants.
    Argued March 15, 1977.
    William J. Althaus, with him Wentworth Darcy Vedder, for appellants; Michael P. Loucks, with him Liverant, Senft and Cohen, for appellee.
   Judgment and orders affirmed.  