Erratum In the list of patents which expired on May 08, 1994, due to failure to pay maintenance fees, in the O.G. of July 19, 1994 and April 11, 1995, the following Reissue Patent should not have appeared: Patent Number Serial Number Issue Date Filing Date Re. 33,279 07/315,242 07/31/90 02/27/89 (4,587,489) (06/539,780) (05/06/86) (10/07/83)