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Filing Detail
Form SC 13D/A - General Statement of Acquisition of Beneficial Ownership: [Amend]
SEC Accession No. 0000807249-10-000335
Filing Date
2010-10-13
Accepted
2010-10-13 10:45:23
Documents
1

Document Format Files

Seq Description Document Type Size
1 kei_01.htm SC 13D/A 281858
  Complete submission text file 0000807249-10-000335.txt   283916
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.: 101120715
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