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NASDAQ: CHKOTCPK: CHKAQ
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FormDescriptionDateFormat
8-KReport of unscheduled material events or corporate eventDec 24, 1997Open Report of unscheduled material events or corporate event in HTML.Open Report of unscheduled material events or corporate event in DOC file.Open Report of unscheduled material events or corporate event in PDF file.Open Report of unscheduled material events or corporate event in XLS file.
8-KReport of unscheduled material events or corporate eventDec 11, 1997Open Report of unscheduled material events or corporate event in HTML.Open Report of unscheduled material events or corporate event in DOC file.Open Report of unscheduled material events or corporate event in PDF file.Open Report of unscheduled material events or corporate event in XLS file.
DEFA14AAdditional proxy soliciting materials - definitiveNov 26, 1997Open Additional proxy soliciting materials - definitive in HTML.Open Additional proxy soliciting materials - definitive in DOC file.Open Additional proxy soliciting materials - definitive in PDF file.Open Additional proxy soliciting materials - definitive in XLS file.
8-KReport of unscheduled material events or corporate eventNov 20, 1997Open Report of unscheduled material events or corporate event in HTML.Open Report of unscheduled material events or corporate event in DOC file.Open Report of unscheduled material events or corporate event in PDF file.Open Report of unscheduled material events or corporate event in XLS file.
10-QQuarterly report which provides a continuing view of a company's financial positionNov 14, 1997Open Quarterly report which provides a continuing view of a company's financial position in HTML.Open Quarterly report which provides a continuing view of a company's financial position in DOC file.Open Quarterly report which provides a continuing view of a company's financial position in PDF file.Open Quarterly report which provides a continuing view of a company's financial position in XLS file.
DEF 14AOfficial notification to shareholders of matters to be brought to a vote ("Proxy")Nov 10, 1997Open Official notification to shareholders of matters to be brought to a vote ("Proxy") in HTML.Open Official notification to shareholders of matters to be brought to a vote ("Proxy") in DOC file.Open Official notification to shareholders of matters to be brought to a vote ("Proxy") in PDF file.Open Official notification to shareholders of matters to be brought to a vote ("Proxy") in XLS file.
SC 13G/AAmendment to a previously filed SC 13GNov 7, 1997Open Amendment to a previously filed SC 13G in HTML.Open Amendment to a previously filed SC 13G in DOC file.Open Amendment to a previously filed SC 13G in PDF file.Open Amendment to a previously filed SC 13G in XLS file.
8-KReport of unscheduled material events or corporate eventNov 6, 1997Open Report of unscheduled material events or corporate event in HTML.Open Report of unscheduled material events or corporate event in DOC file.Open Report of unscheduled material events or corporate event in PDF file.Open Report of unscheduled material events or corporate event in XLS file.
8-KReport of unscheduled material events or corporate eventNov 5, 1997Open Report of unscheduled material events or corporate event in HTML.Open Report of unscheduled material events or corporate event in DOC file.Open Report of unscheduled material events or corporate event in PDF file.Open Report of unscheduled material events or corporate event in XLS file.
8-KReport of unscheduled material events or corporate eventOct 31, 1997Open Report of unscheduled material events or corporate event in HTML.Open Report of unscheduled material events or corporate event in DOC file.Open Report of unscheduled material events or corporate event in PDF file.Open Report of unscheduled material events or corporate event in XLS file.
10-K/AAmendment to a previously filed 10-KOct 31, 1997Open Amendment to a previously filed 10-K in HTML.Open Amendment to a previously filed 10-K in DOC file.Open Amendment to a previously filed 10-K in PDF file.Open Amendment to a previously filed 10-K in XLS file.
PRE 14AA preliminary proxy statement providing notification matters to be brought to a voteOct 30, 1997Open A preliminary proxy statement providing notification matters to be brought to a vote in HTML.Open A preliminary proxy statement providing notification matters to be brought to a vote in DOC file.Open A preliminary proxy statement providing notification matters to be brought to a vote in PDF file.Open A preliminary proxy statement providing notification matters to be brought to a vote in XLS file.
10-K/AAmendment to a previously filed 10-KOct 28, 1997Open Amendment to a previously filed 10-K in HTML.Open Amendment to a previously filed 10-K in DOC file.Open Amendment to a previously filed 10-K in PDF file.Open Amendment to a previously filed 10-K in XLS file.
10-KAnnual report which provides a comprehensive overview of the company for the past yearOct 14, 1997Open Annual report which provides a comprehensive overview of the company for the past year in HTML.Open Annual report which provides a comprehensive overview of the company for the past year in DOC file.Open Annual report which provides a comprehensive overview of the company for the past year in PDF file.Open Annual report which provides a comprehensive overview of the company for the past year in XLS file.
8-KReport of unscheduled material events or corporate eventOct 1, 1997Open Report of unscheduled material events or corporate event in HTML.Open Report of unscheduled material events or corporate event in DOC file.Open Report of unscheduled material events or corporate event in PDF file.Open Report of unscheduled material events or corporate event in XLS file.
NT 10-KNotification that form 10-K will be submitted lateSep 29, 1997Open Notification that form 10-K will be submitted late in HTML.Open Notification that form 10-K will be submitted late in DOC file.Open Notification that form 10-K will be submitted late in PDF file.Open Notification that form 10-K will be submitted late in XLS file.
NT 10-K/AAmendment to a previously filed NT 10-KSep 29, 1997Open Amendment to a previously filed NT 10-K in HTML.Open Amendment to a previously filed NT 10-K in DOC file.Open Amendment to a previously filed NT 10-K in PDF file.Open Amendment to a previously filed NT 10-K in XLS file.
8-KReport of unscheduled material events or corporate eventSep 9, 1997Open Report of unscheduled material events or corporate event in HTML.Open Report of unscheduled material events or corporate event in DOC file.Open Report of unscheduled material events or corporate event in PDF file.Open Report of unscheduled material events or corporate event in XLS file.
8-KReport of unscheduled material events or corporate eventJul 11, 1997Open Report of unscheduled material events or corporate event in HTML.Open Report of unscheduled material events or corporate event in DOC file.Open Report of unscheduled material events or corporate event in PDF file.Open Report of unscheduled material events or corporate event in XLS file.
SC 13G/AAmendment to a previously filed SC 13GJul 9, 1997Open Amendment to a previously filed SC 13G in HTML.Open Amendment to a previously filed SC 13G in DOC file.Open Amendment to a previously filed SC 13G in PDF file.Open Amendment to a previously filed SC 13G in XLS file.
8-KReport of unscheduled material events or corporate eventJun 30, 1997Open Report of unscheduled material events or corporate event in HTML.Open Report of unscheduled material events or corporate event in DOC file.Open Report of unscheduled material events or corporate event in PDF file.Open Report of unscheduled material events or corporate event in XLS file.
NT 11-KNotification that form 11-K will be submitted lateJun 30, 1997Open Notification that form 11-K will be submitted late in HTML.Open Notification that form 11-K will be submitted late in DOC file.Open Notification that form 11-K will be submitted late in PDF file.Open Notification that form 11-K will be submitted late in XLS file.
S-8Securities offered to employees pursuant to employee benefit plansMay 21, 1997Open Securities offered to employees pursuant to employee benefit plans in HTML.Open Securities offered to employees pursuant to employee benefit plans in DOC file.Open Securities offered to employees pursuant to employee benefit plans in PDF file.Open Securities offered to employees pursuant to employee benefit plans in XLS file.
10-QQuarterly report which provides a continuing view of a company's financial positionMay 15, 1997Open Quarterly report which provides a continuing view of a company's financial position in HTML.Open Quarterly report which provides a continuing view of a company's financial position in DOC file.Open Quarterly report which provides a continuing view of a company's financial position in PDF file.Open Quarterly report which provides a continuing view of a company's financial position in XLS file.
8-KReport of unscheduled material events or corporate eventMay 2, 1997Open Report of unscheduled material events or corporate event in HTML.Open Report of unscheduled material events or corporate event in DOC file.Open Report of unscheduled material events or corporate event in PDF file.Open Report of unscheduled material events or corporate event in XLS file.
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