Errata

   In the list of patents which expired on June 06, 1993, due to failure
to pay maintenance fees, in the O.G. of August 24, 1993, the following
patent should not have appeared:

Patent             Serial               Issue            Filing
Number             Number               Date             Date

4,836,561          07/015,863           06/06/89         02/17/87


                                    Errata

   In the list of patents which expired on February 21, 1996, due to
failure to pay maintenance fees, in the O.G. of April 30, 1996, the
following patent should not have appeared:

Patent             Serial               Issue            Filing
Number             Number               Date             Date

4,433,057          06/348,067           02/21/96         07/03/80