ELECTRICAL DEVICES FOR USE IN OR WITH TELEPHONE AND SIMILAR COMMUNICATIONS SYSTEMS-NAMELY, MULTI-FREQUENCY TONE ADAPTION AND CONVERSION APPARATUS FOR ADDING MULTI-FREQUENCY TONE CAPABILITY TO ROTARY DIAL TELEPHONE SYSTEMS OR PARTS THEREOF, MULTI-FREQUENCY TONE RECEIVERS, MULTI-FREQUENCY TONE GENERATORS, KEY SYSTEM TONE INTERCOMS, MULTI-FREQUENCY TONE AMPLIFIERS, VOICE OPERATED SWITCHES, AND SERVICE OBSERVING SYSTEM

ELECTRICAL DEVICES FOR USE IN OR WITH TELEPHONE AND SIMILAR COMMUNICATION SYSTEMS-NAMELY, [ TOUCH DIAL TEST SETS, ] MULTI-FREQUENCY RECEIVERS FOR USE IN TOUCH TELEPHONE NETWORKS AND OTHER M.F. SYSTEMS AND TO EXPAND AN EXISTING MULTI-STATION KEY INTERCOM SYSTEM TO A LARGER NUMBER OF STATIONS, A LEICH PABX CONVERSION SET FOR PRIVATE AUTOMATIC TELEPHONE EXCHANGE SYSTEMS TO PERMIT PROCESSING EITHER A TOUCH OR ROTARY DIAL CALL, AND INTERCOM SYSTEM FOR USE WITH TOUCH DIAL OR COMBINATION TOUCH DIAL ...

Electronic hardware, namely, a gateway/router/firewall switch for access to remote equipment, and software for the administration of user credentials, port security, event logging and authorized user access to secured ports and functions, for use in protecting remote locations such as utility substations

telephone communication equipment; namely, remote call handling interfaces for private branch exchange (PBX) and automatic call distribution (ACD) systems