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Filing Detail
Form SC 13D/A - General Statement of Acquisition of Beneficial Ownership: [Amend]
SEC Accession No. 0000807249-10-000396
Filing Date
2010-12-09
Accepted
2010-12-09 13:32:44
Documents
1

Document Format Files

Seq Description Document Type Size
1 kei_03.htm SC 13D/A 295170
  Complete submission text file 0000807249-10-000396.txt   297225
Mailing Address
Business Address 28775 AURORA RD SOLON OH 44139 2162480400
KEITHLEY INSTRUMENTS INC (Subject) CIK: 0000054991 (see all company filings)

IRS No.: 340794417 | State of Incorp.: OH | Fiscal Year End: 0930
Type: SC 13D/A | Act: 34 | File No.: 005-37166 | Film No.: 101241845
SIC: 3825 Instruments For Meas & Testing of Electricity & Elec Signals

Mailing Address ONE CORPORATE CENTER RYE NY 10580
Business Address ONE CORPORATE CENTER RYE NY 10580-1434 9149215000
GAMCO INVESTORS, INC. ET AL (Filed by) CIK: 0000807249 (see all company filings)

IRS No.: 133056041 | State of Incorp.: NY | Fiscal Year End: 1031
Type: SC 13D/A
SIC: 0000