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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	$4.20	500	Large Shareholder, Officer, Director	120,982	2009-09-09	Filing
Keithley	$4.27	500	Large Shareholder, Officer, Director	120,482	2009-09-09	Filing
Keithley	$4.30	500	Large Shareholder, Officer, Director	119,982	2009-09-08	Filing
Keithley	$4.35	500	Large Shareholder, Officer, Director	119,482	2009-09-08	Filing
Keithley	$4.90	500	Large Shareholder, Officer, Director	118,982	2009-09-01	Filing
Keithley	$5.00	500	Large Shareholder, Officer, Director	118,482	2009-09-01	Filing
Keithley	$5.01	500	Large Shareholder, Officer, Director	117,982	2009-09-01	Filing
Keithley	$5.10	500	Large Shareholder, Officer, Director	117,482	2009-08-31	Filing
Keithley	$5.10	411	Large Shareholder, Officer, Director	116,982	2009-08-25	Filing
Keithley	$5.22	500	Large Shareholder, Officer, Director	116,571	2009-08-24	Filing
Keithley	$5.24	500	Large Shareholder, Officer, Director	116,071	2009-08-24	Filing
Keithley	$5.23	500	Large Shareholder, Officer, Director	115,571	2009-08-24	Filing
Keithley	$5.14	500	Large Shareholder, Officer, Director	115,071	2009-08-21	Filing
Keithley	$5.20	700	Large Shareholder, Officer, Director	114,571	2009-08-21	Filing
Keithley	$5.24	500	Large Shareholder, Officer, Director	113,871	2009-08-18	Filing
Keithley	$4.80	100	Large Shareholder, Officer, Director	113,371	2009-07-29	Filing
Keithley	$4.75	500	Large Shareholder, Officer, Director	113,271	2009-07-29	Filing
Keithley	$4.50	500	Large Shareholder, Officer, Director	112,771	2009-07-28	Filing
Keithley	$4.75	500	Large Shareholder, Officer, Director	112,271	2009-07-28	Filing
Keithley	$4.90	500	Large Shareholder, Officer, Director	111,771	2009-07-28	Filing