With
a low-pressure, low-temperature regime, the enhanced version of the Highlands
provides improved profile control, low-k material preservation and a wider
process window.

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atdf. Internet: http://www.com. Capital expenditures through the first
three quarters of fiscal 2005 were $34,433,000.

S.

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Copper interconnects, as well as low-k,
enable chipmakers to shrink die sizes and pack circuitry closer together while
maintaining speed, computing power and device performance throughout the chip. Additional information may be found at
http://www.org. Fax: 510 -492-5911. The
Company defines EBITDA as net income plus interest expense, income taxes,
depreciation and amortization expense. The Company uses EBITDA as a
supplemental financial measure to assess:

* the financial performance of its assets without regard to financing
methods , capital structures, taxes or historical cost basis;
* its liquidity and operating performance over time in relation to other
companies that own similar assets and that the Company believes
calculate EBITDA in a similar manner; and
* the ability of the Company's assets to generate cash sufficient for
the Company to pay potential interest costs. In addition , the Company's EBITDA
may not be comparable to EBITDA or similar titled measures utilized by other
companies since such other companies may not calculate EBITDA in the same
manner as the Company .

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Since beginning
operations in 1989, the company's core vision has been to help bring
technology leadership and productivity gains to semiconductor manufacturers
worldwide.
tel 510-492 -6518
fax 510-492-2800
lauren.

plaster routinely

SEMATECH Selects Mattson Technology's 300 mm Advanced Strip System to Develop 45 nm Porous Low-k Interconnect Solutions

Mattson's strip system will be used by SEMATECH's
Interconnect Division to develop advanced interconnect structures for 45
nanometer (nm) and below chip generations targeted for Keff of 2."
Busch continued, "We will work with Mattson Technology to develop new low
sidewall damage ash processes. "Our project will seek
solutions aimed at enhancing product performance and yield. It has extensive experience collaborating
with equipment and materials suppliers, as well as government and academic
research centers, to refine the tools and technology necessary to produce
future generations of chips.mattson.11 per share) compared to $4,494,000 ($0.13 $0.

selects tyrol

5 and lower.
Mattson and SEMATECH will work together to develop and optimize low sidewall
damage ash processes for the integration of copper with porous ultra-low
dielectric constant (ULK) materials. As feature sizes decrease, the sidewall damage
contribution to increasing Keff becomes larger.

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(Nasdaq: MTSN), a leading supplier of advanced process equipment used to
manufacture semiconductors, today announced the shipment of an enhanced
version of its Aspen III Highlands system to SEMATECH in Austin, TX. "A key enabler for low
Keff integration schemes is to significantly reduce the sidewall damage (also
known as carbon depletion) on dual-damascene trench sidewalls caused by etch
and ash processing.45 per
share) compared to $1,989,000 ($0. A
discussion of these and other factors, including risks and uncertainties, is
set forth in the Company's Form 10-K for the fiscal year ended September 30,
2004.

traceries tyrol

,
47131 Bayside Parkway, Fremont, Calif.com

millwork vaulted

The Company's EBITDA for the third
quarter of fiscal 2005 was $7,570,000 as compared to $3,145,000 in the same
quarter of fiscal 2004.

STATEMENTS OF OPERATIONS
(Unaudited)
Three Months Ended Nine Months Ended
June 30, June 30,
2005 2004 2005 2004

Operating revenues $31,500,000 $17,112,000 $79,574,000 $47,790,000
Operating costs:
Operating expenses 22,878,000 13,504,000 61,100,000 38,457,000
General and
administrative 1,409,000 648,000 3,192,000 1,867,000
Depreciation 2,387,000 1,156,000 5,519,000 3,381,000
26,674,000 15,308,000 69,811,000 43,705,000

Income from operations 4,826,000 1,804,000 9,763,000 4,085,000
Other income:
Interest income 212,000 58,000 335,000 175,000
Interest expense --- --- (65,000) ---
Gain (loss) on
disposal of assets 149,000 (1,000) 149,000 (4,000)
Gain (loss) on sale of
short-term investments (4,000) (15,000) (4,000) (15,000)
Other --- 143 ,000 239,000 253,000
Income before income tax 5,183,000 1,989,000 10,417,000 4,494,000

Income tax (expense)
benefit:
Current (783,000 ) --- (1,516,000) ---
Deferred (1,043,000) --- (1,617 ,000) ---
(1,826,000) --- (3,133,000) ---

Net income $3,357,000 $1,989,000 $7,284,000 $4,494,000

Net income per
common share $0.11 $0.

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To create advanced integrated circuits (ICs), the semiconductor industry
is migrating from aluminum to copper wires insulated with low-k materials, to
reduce the power dissipation, signal cross talk and delay of on chip 'wiring. For more information, please contact Mattson Technology, Inc.

Mattson Technology Contact
Lauren Vu
Mattson Technology, Inc.

routinely shifts

The Highlands' ability to reduce operational steps simplifies
integration and provides customers unparalleled cost of ownership (COO).sematech. ATDF also develops baseline processes, accepted industry-wide,
that bring new tools and materials to manufacturing faster , at lower cost.35 per share) in the same quarter of fiscal
2004.

Secretary of the Interior defines historic preservation as 'retention of all historic fabric through conservation, maintenance, and repair .

severely craftspeople

The system meets the stringent requirements of advanced BEOL
applications for 65 nm and below manufacturing , including ULK ash and residue
and barrier layer removal.

About Mattson Technology, Inc . While no increase in the
Company's crew count is currently anticipated, the Company continues to grow
and expend capital by upgrading its recording capacity, expanding the channel
count of existing crews, adding to its energy source fleet, and making
technical improvements in all phases of its operations. These additions
present opportunities for revenue growth and profitability as the Company
responds to its clients desire for higher resolution subsurface images.

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About SEMATECH
SEMATECH is a global semiconductor technology development consortium that
has effectively represented the semiconductor manufacturing industry on
innovation issues since 1988. ATDF customers can
confidentially test new designs, integration methodologies, and prototype
systems while protecting their own intellectual property, and development
partners can work closely with one another in a custom manufacturing
environment. For the nine
months ending June 30, revenues were $79,574,000 compared to $47,790,000 in
the 2004 period, an increase of 66 percent. The Company's revenue growth is
due to the rapid expansion from seven seismic data acquisition crews in June
2004 to the current level of eleven, price improvements in the markets for its
services and more favorable contract terms with client companies.

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"The Interconnect Division's overall mission is to develop integration
schemes with Keff 2. MacKnight, chief operating officer of
Mattson Technology. SEMATECH conducts state-of-the-art research,
and is a highly regarded technology partner whose goal is to promote the
interests common to all chipmakers. MIDLAND, Texas, Dawson Geophysical
Company (Nasdaq: DWSN ) today reported revenues of $31,500,000 for the third
quarter of its 2005 fiscal year ending June 30, 2005 compared to $17,112,000
in the same quarter of fiscal 2004, an increase of 84 percent. Earnings for the June quarter were positively impacted by extremely
favorable weather conditions and crew productivity early in the quarter.00 per share;
5,000,000 shares authorized,
none outstanding --- ---
Common stock-par value $.33 1/3 per share;
10,000,000 shares authorized, 7,461,794
and 5,633,794 shares issued and outstanding
in each period 2,487,000 1,878,000
Additional paid-in capital 80,569,000 39,949,000
Other comprehensive income, net of tax (110,000) (28,000)
Retained earnings 15,767,000 8,483,000

Total stockholders' equity 98,713,000 50,282,000

$115,682,000 $56,759,000

Non GAAP Financial Numbers:
Reconciliation of EBITDA to Net Income
(Unaudited)

Three Months Ended
June 30,
2005 2004
(in thousands)
Net Income $3,357 $1,989
Depreciation 2,387 1,156
Interest expense --- ---
Income tax (benefit) expense 1,826 ---
EBITDA $7,570 $3,145

' This category also includes resources for the related practice of rehabilitation, which includes replacement of severely deteriorated elements of the structure.

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5 for the 45 nm node and beyond," said Eric Busch,
Interconnect Unit process development program manager . 94538.vu@mattson.

Dawson Geophysical Company Reports Third Quarter Results

Dawson Geophysical Company is the leading provider of U.45 $0.80

Weighted average
equivalent common
shares outstanding 7,445,525 5,584,442 6,446,607 5,535,741

Weighted average
equivalent common
shares outstanding-
assuming dilution 7,540 ,963 5,681,372 6,542,479 5,601,703

BALANCE SHEETS

June 30, September 30,
2005 2004
(Unaudited)
ASSETS
Current assets:
Cash and cash equivalents $5,527,000 $3,587,000
Short-term investments 20,374,000 4 ,130,000
Accounts receivable, net of allowance
for doubtful accounts of $335,000 in
2005 and $199,000 in 2004 28,186,000 16,979,000
Prepaid expenses and other assets 765,000 440,000
Current deferred tax asset 1,968,000 ---

Total current assets 56,820,000 25,136,000

Deferred tax asset --- 1,648,000

Property, plant and equipment 126,517,000 94,050,000
Less accumulated depreciation (67,655,000) (64,075,000)

Net property, plant and equipment 58,862,000 29,975,000

$115,682,000 $56,759,000

LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable $9,381,000 $3,357,000
Accrued liabilities:
Payroll costs and other taxes 1,603,000 742,000
Other 1,363,000 971,000
Deferred revenue 2,685,000 1,407,000

Total current liabilities 15 ,032,000 6,477,000

Deferred tax liability 1,937,000 ---

Stockholders' equity:
Preferred stock-par value $1.

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Net income for the third quarter of fiscal 2005 was $3,357,000 ($0. Reflected in the current quarter's earning per
share data is the full effect of the 1,800,000 additional shares issued in a
public offering completed in March of 2005. For the nine months ending June
30, net income was $7,284,000 ($1. These risks
include, but are not limited to, dependence upon energy industry spending, the
volatility of oil and gas prices, weather interruptions, the ability to obtain
land access rights of way and the availability of capital resources.45 $0.35 $1.

supervising vaulted

Founded in 1952, Dawson acquires and processes 2-D , 3-D, and multi-
component seismic data solely for its clients, ranging from major oil and gas
companies to independent oil and gas operators as well as providers of multi-
client data libraries.
This press release contains information about the Company's EBITDA.
In accordance with the Safe Harbor provisions of the Private Securities
Litigation Reform Act of 1995, Dawson Geophysical Company cautions that
statements in this press release which are forward-looking and which provide
other than historical information involve risks and uncertainties that may
materially affect the Company 's actual results of operations.

This category is for architects, planners, craftspeople, and materials manufacturers whose primary speciality is historic preservation and rehabilitation and who routinely serve a national, international, or broadly regional clientele.

supervising selects

"Our enhanced Aspen III Highlands system demonstrated
excellent results in competitive evaluations for low-k strip, residue clean
and other advanced back-end-of-line (BEOL) applications.
Demand for the Company's services continues at record levels as a result
of continued brisk exploration and development activity by the Company 's
client base due to higher oil and gas prices. Dawson Geophysical Company disclaims any intention or obligation to
revise any forward-looking statements, whether as a result of new information,
future events, or otherwise.

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"

About the Aspen III Highlands
Built on Mattson's production -proven, high-throughput Aspen III platform,
the Aspen III Highlands features a proprietary ICP technology with a bias
capability that enables independent control of density and energy at low
temperatures .

About ATDF
ATDF, a wholly owned subsidiary of SEMATECH, is a leading technology R +D
center where research meets manufacturing for semiconductor manufacturers,
equipment and materials suppliers, and others. is a leading supplier of semiconductor wafer
processing equipment used in the fabrication of integrated circuits. However, the term EBITDA is not defined
under generally accepted accounting principles and EBITDA is not a measure of
operating income, operating performance or liquidity presented in accordance
with generally accepted accounting principles.

The U.

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Mattson Technology, Inc. Further, the results presented by EBITDA cannot be
achieved without incurring the costs that the measure excludes: interest,
taxes, depreciation and amortization.

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The 300
mm system is being installed at ATDF, SEMATECH's R+D wafer fab, which also
supports external customers .'
These effects can dominate the performance of complex IC's, and the negative
impacts grow as feature sizes shrink."
"As we move toward smaller device geometries, chipmakers face multiple
challenges as they integrate low-k dielectrics into their advanced
manufacturing processes," said Robert B. The Company believes its current
order book is sufficient to maintain operations at full capacity well into the
first quarter of calendar 2006. onshore seismic
data acquisition services as measured by the number of active data acquisition
crews. A reconciliation of the Company's
EBITDA to its net income is presented in the table following the text of this
press release.81

Net income per common
share-assuming
dilution $0.

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FREMONT, Calif ."
"Porous low-k dielectric integration brings a unique set of challenges in
the containment and elimination of process-induced damage," said Sitaram
Arkalgud, director of SEMATECH's Interconnect Division.
More information can be found at http://www. The
Company has yet to realize the full effect of the eleventh crew which was
placed into service in May.80
per share) in the prior year period.

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Telephone: 800-MATTSON /
510-657-5900.36 $1.

craftspeople silman

com.
Weather conditions for the remainder of the quarter were less favorable.
The Company announced that its Board of Directors has approved an
additional $5,250,000 of capital expenditures bringing the approved capital
budget for fiscal 2005 to $37,250,000.S.

The Company also understands that such data are used by investors to
assess the Company's performance. When assessing the Company's
operating performance or liquidity , investors and others should not consider
this data in isolation or as a substitute for net income , cash flow from
operating activities or other cash flow data calculated in accordance with
generally accepted accounting principles.

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, Mattson Technology,
Inc. This cooperative development activity will
enable SEMATECH to begin achieving lower Keff-integrated device structures
and, in turn, position our members and the industry to further address
sidewall issues. Over the past
decade , we have partnered with SEMATECH on several joint development programs
for advanced transistor formation , and we are very pleased to work with the
Interconnect Division using our copper/low-k strip technologies to provide the
industry with new interconnect solutions for the 45 nm and below era. The
company 's dry strip and RTP equipment utilize innovative technology to deliver
advanced processing capabilities on high-productivity platforms for the
fabrication of current- and next-generation devices.