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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
1049658	L Thomas Davis	1460 Lou'S Loop Golden CO 80403		Yes	No	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	2011-02-09	3,150	$47.35	12,327	No	4	M	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2011-02-09	1,950	$103.00	10,377	No	4	S	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2011-02-09	1,200	$103.03	9,177	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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Options (right to buy)	Disposition	2011-02-09	3,150	$0.00	3,150	$47.35

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0	2010-02-08	2016-02-08	No	4	M	Direct

Footnotes

These shares were issued upon the exercise of options (described in Table II) and then immediately sold.
The shares that were issued upon the exercise of options were immediately sold, as is presented in Table I.
This option became exercisable in equal annual installments over a four year period. The option became fully exercisable on February 8, 2010.
This number represents the exercise of the options issued to Mr. Davis in February 2006 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 Cell 2 of this Table II.