U.S. federal trademark · Serial No. 73807978 · Reg. No. 368001
BUILDING ENTRANCE SECURITY SYSTEMS, NAMELY, A VISITOR'S TELEPHONE PANEL HAVING A KEY PAD, A TELEPHONE TRANSMITTER/RECEIVER, AND AUTODIALER AND ELECTRONIC INTERFACES FOR INTERFACING THE VISITOR PANEL WITH THE TENANT OR SUBSCRIBER TELEPHONE LINES IN A CENTRAL OFFICE EXCHANGE
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