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Keithley Instruments Inc (KEI)

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Insider Trading: Purchases

Insider	Price	Amount	Relationship	Remaining Holdings	Date	Form 4
Keithley	$4.38	1,000	Large Shareholder, Officer, Director	85,757	2009-05-11	Filing
Keithley	$4.36	1,334	Large Shareholder, Officer, Director	84,757	2009-05-05	Filing
Keithley	$4.12	1,000	Large Shareholder, Officer, Director	83,423	2009-05-04	Filing
Keithley	$3.08	1,112	Large Shareholder, Officer, Director	82,423	2009-04-29	Filing
Keithley	$3.44	1,000	Large Shareholder, Officer, Director	81,311	2009-04-28	Filing
Keithley	$3.39	500	Large Shareholder, Officer, Director	80,311	2009-04-27	Filing
Keithley	$3.36	400	Large Shareholder, Officer, Director	79,811	2009-04-27	Filing
Keithley	$3.19	1,520	Large Shareholder, Officer, Director	79,411	2009-04-21	Filing
Keithley	$3.37	1,500	Large Shareholder, Officer, Director	77,891	2009-04-20	Filing
Keithley	$3.42	1,719	Large Shareholder, Officer, Director	76,391	2009-04-14	Filing
Keithley	$3.36	1,200	Large Shareholder, Officer, Director	74,672	2009-04-13	Filing
Keithley	$3.29	1,543	Large Shareholder, Officer, Director	73,472	2009-04-09	Filing
Keithley	$3.20	1,000	Large Shareholder, Officer, Director	71,929	2009-04-07	Filing
Keithley	$3.25	500	Large Shareholder, Officer, Director	70,929	2009-04-07	Filing
Keithley	$3.20	574	Large Shareholder, Officer, Director	70,429	2009-03-31	Filing
Keithley	$3.25	500	Large Shareholder, Officer, Director	69,855	2009-03-31	Filing
Keithley	$3.30	500	Large Shareholder, Officer, Director	69,355	2009-03-31	Filing
Keithley	$3.21	500	Large Shareholder, Officer, Director	68,855	2009-03-30	Filing
Keithley	$3.19	1,000	Large Shareholder, Officer, Director	68,355	2009-03-30	Filing
Keithley	$3.21	1,598	Large Shareholder, Officer, Director	67,355	2009-03-24	Filing