Patent Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 12/25/98

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,821,281        06/907,545        09/15/86        04/11/89       12/30/98
5,288,885        07/971,875        11/05/92        02/22/94       12/30/98
5,320,889        07/781,009        10/21/91        06/14/94       12/30/98
5,321,891        07/948,337        09/21/92        06/21/94       12/30/98
5,338,495        08/136,914        10/18/93        08/16/94       12/29/98