0001026608-99-000025 10-K 2 19981231 19990325 AAON INC 0000824142 3585 870448736 NV 1231 10-K 34 000-18953 99572686 900 PETROLEUM CLUB BUILDING 601 SOUTH BOULDER TULSA OK 74119-1300 9185832266 2425 SOUTH YUKON 2425 SOUTH YUKON TULSA OK 74107 DIAMOND HEAD RESOURCES INC 19900808 10-K 1 000102660899000025-001-seq1-10-k.txt ANNUAL FORM 10-K EX-27 2 000102660899000025-002-seq2-ex-27.txt