Attached files
Exhibit 21
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SUBSIDIARIES
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The following is a list of the significant and other active and inactive subsidiaries of the Company as of September 23, 2010:
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Significant Subsidiaries
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Jurisdiction of Incorporation
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Telecommunications Transmission Segment
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Comtech EF Data Corp.
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Delaware
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Mobile Data Communications Segment
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Comtech Mobile Datacom Corporation
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Delaware
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Other Active Subsidiaries
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Telecommunications Transmission Segment
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Comtech Systems, Inc.
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Delaware
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Memotec Inc. (a subsidiary of Comtech EF Data Corp.)
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New Brunswick, Canada
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Comtech EF Data Pte. Ltd.
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Singapore
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Beijing Comtech EF Data Equipment Repair Service, Co., Ltd.
(a subsidiary of Comtech EF Data Corp.)
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China
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Mobile Data Communications Segment
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Comtech AeroAstro, Inc.
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Delaware
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RF Microwave Amplifiers Segment
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Comtech PST Corp.
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New York
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Comtech Xicom Technology, Inc.
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California
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Xicom Technology Europe, Ltd. (a subsidiary of Comtech Xicom Technology, Inc.)
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United Kingdom
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Inactive Subsidiaries
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ARMER Communications Engineering Services, Inc.
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Delaware
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Comtech Antenna Systems, Inc.
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Delaware
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Comtech Communications Corp.
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Delaware
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Comtech Comstream, Inc.
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Delaware
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Comtech CPI Electron Devices Corp.
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Delaware
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Comtech CPI Microwave Corp.
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Delaware
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Comtech Systems International, Inc.
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Delaware
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Comtech Tolt Technologies, Inc.
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Delaware
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Tiernan Radyne Comstream, Inc.
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Delaware
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