0000950131-99-004896 424B5 1 19990813 ONEOK INC /NEW/ 0001039684 4923 731520922 OK 0831 424B5 33 333-76375 99687169 100 WEST 5TH ST TULSA OK 74103 9185887000 100 WEST 5TH ST TULSA OK 74103 WAI INC 19970519 424B5 1 000095013199004896-001-seq1-424b5.txt FINAL PROSPECTUS SUPPLEMENT