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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
1049653	T Thomas Mcentire	7007 Pinemont Drive Houston TX 77040	Vice President,Cfo & Secretary	No	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	2011-03-04	2,000	$7.12	13,000	No	4	M	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2011-03-04	2,000	$100.05	11,000	No	4	S	Direct
Common Stock, Par Value $.01 Per Share	Acquisiton	2011-03-07	2,000	$7.12	13,000	No	4	M	Direct
Common Stock, Par Value $.01 Per Share	Disposition	2011-03-07	2,000	$101.11	11,000	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	S	Direct
No	4	M	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	2011-03-04	2,000	$0.00	2,000	$7.12
Common Stock	Options (right to buy)	Disposition	2011-03-07	2,000	$0.00	2,000	$7.12

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
55,404	2007-02-28	2013-02-28	No	4	M	Direct
53,404	2007-02-28	2013-02-28	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 28, 2007.
This number represents the partial exercise of the options issued to Mr. McEntire in February 2003 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 having varying exercise dates, expiration dates and exercise prices.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $100.00 to $100.22, inclusive. The reporting person undertakes to provide OYO Geospace Corporation, any security holder of OYO Geospace Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (7) and (8) to this Form 4.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $100.95 to $101.32, inclusive.