SEC Filings

Filing date	Form	Description	View
Dec 19, 2013	10-K	Annual report which provides a comprehensive overview of the company for the past year	View HTML 0000046619-13-000017.pdf 0000046619-13-000017.xls EX-101.INS - XBRL INSTANCE DOCUMENT
Dec 18, 2014	10-K	Annual report which provides a comprehensive overview of the company for the past year	View HTML 0000046619-14-000056.pdf 0000046619-14-000056.xls EX-101.INS - XBRL INSTANCE DOCUMENT
Dec 17, 2015	10-K	Annual report which provides a comprehensive overview of the company for the past year	View HTML 0000046619-15-000078.pdf 0000046619-15-000078.xls EX-101.INS - XBRL INSTANCE DOCUMENT
Dec 15, 2016	10-K	Annual report which provides a comprehensive overview of the company for the past year	View HTML 0000046619-16-000162.pdf 0000046619-16-000162.xls EX-101.INS - XBRL INSTANCE DOCUMENT
Dec 21, 2017	10-K	Annual report which provides a comprehensive overview of the company for the past year	View HTML 0000046619-17-000085.pdf 0000046619-17-000085.xls EX-101.INS - XBRL INSTANCE DOCUMENT
Dec 20, 2018	10-K	Annual report which provides a comprehensive overview of the company for the past year	View HTML 10.31.2018 Form 10K.pdf 2.6 MB 0000046619-18-000117.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
Dec 19, 2019	10-K	Annual report which provides a comprehensive overview of the company for the past year	View HTML 10.31.2019 Form 10K.pdf 2.6 MB 0000046619-19-000095.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
Dec 23, 2020	10-K	Annual report which provides a comprehensive overview of the company for the past year	View HTML Q4-2020-12-23-15-35.cleaned.pdf 1.2 MB 0000046619-20-000078.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA
Dec 21, 2021	10-K	Annual report which provides a comprehensive overview of the company for the past year	View HTML 10.31.21 Q4 10K-2021-12-21-16-08.pdf 1.1 MB 0000046619-21-000085.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA
Dec 21, 2022	10-K	Annual report which provides a comprehensive overview of the company for the past year	View HTML 10.31.2022 HEI Q4 10K-2022-12-21-16-13.pdf 0000046619-22-000066.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA
Dec 20, 2023	10-K	Annual report which provides a comprehensive overview of the company for the past year	View HTML 10.31.23 10K-2023-12-20-16-45.pdf 0000046619-23-000163.xls EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA
Jan 16, 1996	10-K405	Annual report. The Regulation S-K Item 405 box on the cover page is checked	View HTML 0000950170-96-000014.pdf 0000950170-96-000014.xls
Jan 15, 1999	10-K405	Annual report. The Regulation S-K Item 405 box on the cover page is checked	View HTML 0000950144-99-000335.pdf 0000950144-99-000335.xls
Jan 29, 2002	10-K405	Annual report. The Regulation S-K Item 405 box on the cover page is checked	View HTML 0001021408-02-001078.pdf 0001021408-02-001078.xls
Jan 25, 2001	10-K405	Annual report. The Regulation S-K Item 405 box on the cover page is checked	View HTML 0000950170-01-000098.pdf 0000950170-01-000098.xls
Feb 10, 2012	CORRESP	CORRESP	View HTML 0001133796-12-000024.pdf 0001133796-12-000024.xls
Apr 01, 2016	CORRESP	CORRESP	View HTML 0000046619-16-000104.pdf 0000046619-16-000104.xls
May 08, 2014	CORRESP	CORRESP	View HTML 0000046619-14-000026.pdf 0000046619-14-000026.xls
Oct 24, 2019	CORRESP	CORRESP	View HTML 0000046619-19-000067.pdf 0000046619-19-000067.xls
Mar 24, 2008	CORRESP	CORRESP	View HTML 0001133796-08-000095.pdf
Feb 21, 2003	DEFR14A	DEFR14A	View HTML 0001133796-03-000012.pdf 0001133796-03-000012.xls
Feb 22, 2010	DEFR14A	DEFR14A	View HTML 0001133796-10-000056.pdf 0001133796-10-000056.xls
Apr 12, 2023	144	Filed by "insiders" prior intended sale of restricted stock. Non-EDGAR filing	View HTML 0000046619-23-000069.pdf
Sep 12, 2023	144	Filed by "insiders" prior intended sale of restricted stock. Non-EDGAR filing	View HTML 0000046619-23-000126.pdf
Oct 17, 2023	144	Filed by "insiders" prior intended sale of restricted stock. Non-EDGAR filing	View HTML 0000046619-23-000133.pdf

Data provided by Kaleidoscope.