Annual Reports Title 2025 Annual Report 2024 Annual Report 2023 Annual Report 2022 Annual Report 2021 Annual Report Proxy Materials Filing date View May 12, 2026 View HTML 0000006845-26-000036.pdf 0000006845-26-000036.rtf 0000006845-26-000036.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA May 12, 2026 View HTML 0000006845-26-000034.pdf 0000006845-26-000034.rtf May 13, 2025 View HTML 0000006845-25-000100.pdf 0000006845-25-000100.rtf 0000006845-25-000100.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA May 13, 2025 View HTML 0000006845-25-000101.pdf 0000006845-25-000101.rtf 0000006845-25-000101.xls Jun 03, 2024 View HTML 0000006845-24-000177.pdf 0000006845-24-000177.rtf 0000006845-24-000177.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA