$NSC SEC Filings

Filing Filed On
SC 13D/A 20 Feb 2001
FINAL AMENDMENT 03 Oct 1997
SCHEDULE 13D AMENDMENT 04 Sep 1997
SCHEDULE 13D - AMENDMENT NO. 1 18 Aug 1997
SC 13D/A 03 Jul 1996
SC 13D/A 13 May 1996
SC 13D/A 31 Oct 1995
SC 13D/A 14 Oct 1994