Errata

   In the list of patents which expired on November 23, 1994, due to
failure to pay maintenance fees, in the O.G. of January 31, 1995, the
following patent should not have appeared:

Patent No.         Serial No.         Issue Date          Filing Date

Re. 32,080         06/640,865          02/11/86              08/15/84
(4,360,255)       (06/286,332)        (11/23/82)           (07/23/81)


   In the list of patents which expired on December 26, 1993, due to
failure to pay maintenance fees, in the O.G. of March 15, 1994, the
following patent should not have appeared:

Patent No.         Serial No.         Issue Date          Filing Date

Re. 34,561         07/816,028          03/15/94              12/30/91
(4,890,573)       (07/223,630)        (01/02/90)           (07/25/88)


   In the list of patents which expired on December 04, 1994, due to
failure to pay maintenance fees, in the O.G. of February 14, 1995, the
following patent should not have appeared:

Patent No.         Serial No.         Issue Date          Filing Date

4,362,173          06/247,561          12/07/82              08/01/80