U.S. federal trademark · Serial No. 73676211 · Reg. No. 1481478
MODEM SHARING APPARATUS; AUTOMATIC CALLING UNITS; DUAL-DIAL BACKUP UNITS; PROTOCOL CONVERTERS; ERROR CONTROLLERS; DIGITAL DATA SERVICE NETWORK PRODUCTS - NAMELY, DATA SERVICE UNITS AND CHANNEL SERVICE UNITS; MULTIPLE MODEM ASSEMBLIES AND EQUIPMENT RACKS; LINE DRIVERS; AND MULTIPLEXERS
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