0000950130-99-000538 424B2 1 19990204 ONEOK INC /NEW/ 0001039684 4923 731520922 OK 1231 424B2 33 333-62279 99520920 100 WEST 5TH ST TULSA OK 74103 9185887000 100 WEST 5TH ST TULSA OK 74103 WAI INC 19970519 424B2 1 000095013099000538-001-seq1-424b2.txt PRELIMINARY PROSPECTUS SUPPLEMENT