				    Errata
   
   In the list of patents which expired on December 08, 1992, due to
failure to pay maintenance fees, in the O.G. of February 16, 1993, the
following patent should not have appeared:

Patent Number	     Serial Number	  Issue Date	    Filing Date

4,790,107	      06/921,123	   12/13/88	       10/21/86
