0001026608-02-000004 10-K 1 20011231 20020319 AAON INC 0000824142 3585 870448736 NV 1231 10-K 34 000-18953 02578819 2425 SOUTH YUKON TULSA OK 74107 9185832266 2425 SOUTH YUKON TULSA OK 74107 DIAMOND HEAD RESOURCES INC 19900808 10-K 1 aaon_10k01.txt FORM 10-K FOR THE YEAR ENDED 12/31/2001