0000950131-00-002687 424B5 1 20000419 ONEOK INC /NEW/ 0001039684 4923 731520922 OK 1231 424B5 33 333-76375 605010 100 WEST 5TH ST TULSA OK 74103 9185887000 100 WEST 5TH ST TULSA OK 74103 WAI INC 19970519 424B5 1 000095013100002687-001-seq1-424b5.txt FINAL PROSPECTUS SUPPLEMENT