Errata

   In the list of patents which expired on March 13, 1996, due to failure
to pay maintenance fees, in the O.G. of May 21, 1996, the following
patent should not have appeared:

Patent Number     Serial Number     Issue Date     Filing Date

Re. 32,471         06/693,879       08/11/87          01/23/85
(4,435,854)       (06/247,776)     (03/13/84)        (03/26/81)


                                    Errata

   In the list of patents which expired on March 21, 1993, due to failure
to pay maintenance fees, in the O.G. of June 08, 1993, the following
patent should not have appeared:

Patent Number     Serial Number     Issue Date     Filing Date

4,813,924          06/710,018       03/21/89          03/08/85