EXHIBIT 21.1 LIST OF SUBSIDIARIES LIST OF SUBSIDIARIES OF COMMUNICATIONS INSTRUMENTS, INC. (AS OF 12/31/99) Name of Entity Name of Owner -------------- ------------- Electro-Mech, S. A. de C. V., a corporation Communications Instruments, Inc., a organized under the laws of Mexico North Carolina corporation Kilovac Corporation, A California corporation Communications Instruments, Inc., a North Carolina corporation Corcom, Inc., an Illinois corporation Communications Instruments, Inc., a North Carolina corporation Products Unlimited Corporation, an Iowa Communications Instruments, Inc., a corporation North Carolina corporation Kilovac International, Inc., a California Kilovac Corporation, a California corporation corporation Kilovac International FSC, Ltd., a Kilovac Corporation, a California corporation organized under the laws of corporation Jamaica Corcom, S. A. de C. V., a corporation Corcom, Inc., an Illinois corporation organized under the laws of Mexico Corcom West Indies Ltd., a corporation Corcom, Inc., an Illinois corporation organized under the laws of Barbados Corcom International Ltd., a corporation Corcom, Inc., an Illinois corporation organized under the laws of Barbados Corcom GmbH, a corporation organized Corcom, Inc., an Illinois corporation under the laws of Germany Corcom Far East Ltd., a corporation Corcom, Inc., an Illinois corporation organized under the laws of Hong Kong Marc Industries, Inc., an Iowa corporation Products Unlimited Corporation, an Iowa corporation SOL Industries, Inc., an Iowa corporation Products Unlimited Corporation, an Iowa corporation GW Industries, Inc., an Iowa corporation Products Unlimited Corporation, an Iowa corporation