EXHIBIT C
Each of the
undersigned hereby agree to file this schedule jointly pursuant to
Rule 13d-1(k)(l).
CIRCUIT HOLDINGS, L.L.C.,
a Delaware limited liability company
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| By: |
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Thayer Equity Partners III, L.P.,
a Delaware limited partnership,
its managing member
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/s/ Barry E. Johnson
Barry E. Johnson
Secretary, Treasurer and
Chief Financial Officer
THAYER EQUITY INVESTORS IV, L.P.,
a Delaware limited partnership
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| By: |
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TC Equity Partners IV, L.L.C.,
a Delaware limited liability company,
its General Partner |
/s/ Barry E. Johnson
Barry E. Johnson
Secretary, Treasurer and
Chief Financial Officer
FREDERIC V. MALEK
/s/ Barry E. Johnson
Barry E. Johnson, Attorney-in-Fact
PAUL G. STERN
/s/ Barry E. Johnson
Barry E. Johnson, Attorney-in-Fact
Dated: February 13, 2004
THAYER EQUITY INVESTORS III, L.P.,
a Delaware limited partnership
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| By: |
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TC Equity Partners, L.L.C.,
Delaware limited liability company,
its General Partner |
/s/ Barry E. Johnson
Barry E. Johnson
Secretary, Treasurer and
Chief Financial Officer
TC CIRCUITS, LLC,
a Delaware limited liability company
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| By: |
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TC Co-Investors, L.L.C.
a Delaware limited liability company,
its Managing Member |
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| By: |
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TC Management Partners, L.L.C.
a Delaware limited liability company,
its Managing Member |
/s/ Barry E. Johnson
Barry E. Johnson
Secretary, Treasurer and
Chief Financial Officer
CARL J. RICKERTSEN
/s/ Barry E. Johnson
Barry E. Johnson, Attorney-in-Fact
JEFFREY W. GOETTMAN
/s/ Barry E. Johnson
Barry E. Johnson, Attorney-in-Fact
DANIEL M. DICKINSON
/s/ Barry E. Johnson
Barry E. Johnson, Attorney-in-Fact