0001026608-99-000020 8-K 1 19990317 1 19990317 AAON INC 0000824142 3585 870448736 NV 1231 8-K 34 000-18953 99567287 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 8-K 1 000102660899000020-001-seq1-8-k.txt FORM 8-K