0001026608-02-000010 DEF 14A 1 20020604 20020426 AAON INC 0000824142 3585 870448736 NV 1231 DEF 14A 34 000-18953 02622006 2425 SOUTH YUKON TULSA OK 74107 9185832266 2425 SOUTH YUKON TULSA OK 74107 DIAMOND HEAD RESOURCES INC 19900808 DEF 14A 1 aaon_def14a02.txt PROXY STATEMENT FOR 2002 ANNUAL MEETING