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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1001115	Oyo Geospace Corp	OYOG	Measuring & Controlling Devices, Nec (3829)	760447780

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1049654	J Michael Sheen	7007 Pinemont Drive Houston TX 77040	Svp & Chief Technical Officer	Yes	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock, Par Value $.01 Per Share	Acquisiton	2012-02-03	7,922	$17.56	37,922	No	4	M	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2012-02-03	4,000	$100.00	33,922	No	4	S	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2012-02-03	2,000	$100.10	31,922	No	4	S	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2012-02-03	1,000	$100.20	30,922	No	4	S	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2012-02-03	2,000	$100.30	28,922	No	4	S	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2012-02-03	922	$100.51	28,000	No	4	S	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2012-02-03	2,000	$102.00	26,000	No	4	S	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2012-02-03	5,000	$104.00	21,000	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Options (right to buy)	Disposition	2012-02-03	7,922	$0.00	7,922	$17.56

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
22,078	2009-12-05	2018-12-05	No	4	M	Direct

Footnotes

These shares were issued upon the exercise of options (described in Table II) and then immediately sold. The sales reported in this Form 4 were effected pursuant to Rule 10b5-1 trading plans adopted by the reporting person.
The shares that were issued upon the exercise of options were immediately sold, as is presented in Table I.
This option has become exercisable in four equal annual installments, and will be fully exercisable on December 5, 2012.
This number represents the partial exercise of the options granted to the reporting person on December 5, 2008 to purchase shares of common stock, par value $.01 per share, of OYO Geospace Corporation.
Pursuant to General Instruction 4(c)(iii) of Form 4, the exercise price is reported in Column 2 of this Table II.
Includes options to purchase shares of common stock, par value $.01 per share, of OYO Geospace Corporation with an expiration date of December 5, 2018 and an exercise price of $17.56 per share. These options will be fully exercisable on December 5, 2012.
A portion of these shares were issued upon the exercise of options (described in Table II) and then immediately sold.