Intercom system

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Ritron, Inc.

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MAS Intercom

MAS Intercom

DoorKing Inc.

DoorKing Inc.

Code Blue Corporation

Code Blue Corporation

Lee Dan Communications Inc.

Jeron Electronics Systems Inc.

Janus Elevator Products

Federal APD Inc./Federal Signal Corp.

Electronic Micro Systems Inc./VPP

Dukane Corp. (Communucations Div.)

Courterport Corp.

Chase Security Systems Inc.

Barantec Inc.

Audio Technology Inc.

Antron Products

Alpha Communications

Aiphone Corp.


Southern Steel Co.

Tai Auto

Talk-A-Phone Co.

TOA Electronics Inc.

Trigon Electronics Inc.

Universal Security Instruments Inc.

Versus Technology Inc.