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HOUSTON, Feb. 9 /PRNewswire-FirstCall/ — Input/Output, Inc. (NYSE: IO)
announced that it has filed a registration statement on Form S-3 with the U.S.
Securities and Exchange Commission to register for resale its 5.50%
Convertible Senior Notes due 2008 and any shares of IO common stock issuable
upon conversion of the notes.

As previously announced, an aggregate principal amount of $60 million of
these notes was issued and sold in a private placement and in Rule 144A
transactions in December 2003. The selling securityholders may use the
prospectus relating to the registration statement from time to time to resell
their notes and any shares of IO common stock issuable upon conversion of the
notes. IO will not receive any proceeds from the sale of the notes or any
shares of IO common stock issuable upon conversion of the notes.

While the registration statement relating to these notes and shares of IO
common stock issuable upon conversion of the notes has been filed with the
Securities and Exchange Commission, it has not yet become effective. These
securities may not be sold nor may offers to buy be accepted prior to the time
the registration statement becomes effective except in reliance on an
applicable exemption from the registration requirements of the Securities Act.
This press release shall not constitute an offer to sell or the solicitation
of an offer to buy nor shall there be any sale of these securities in any
State in which such offer, solicitation or sale would be unlawful prior to
registration or qualification under the securities laws of such State.

IO is the major independent provider of seismic equipment and acquisition
imaging technology for land, marine and seabed applications.

CONTACTS: J. Michael Kirksey

Chief Financial Officer

Input/Output (281) 879-3672

Jack Lascar, Partner

Karen Roan, Vice President

DRG&E (713) 529-6600

SOURCE Input/Output, Inc. 02/09/2004

CONTACT: J. Michael Kirksey, Chief Financial Officer of Input-Output,
Inc., +1-281-879-3672; or Jack Lascar, Partner, or Karen Roan, Vice President,
both of DRG&E, +1-713-529-6600, for Input-Output, Inc.

(IO)

CO: Input/Output, Inc.

ST: Texas

IN: OIL

SU: