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TELEPHONE EQUIPMENT-NAMELY, KEY TELEPHONE SYSTEMS, KEY TELEPHONE STATION SETS, KEY SERVICE UNITS, POWER SUPPLIES, DIRECT STATION SELECTION CONSOLES, INTERCOM AND DOOR ANSWERING BOXES, DOOR CHIME BOXES, APPLIQUE BOXES FOR INTERFACING SINGLE-LINE TELEPHONES TO A KEY TELEPHONE SYSTEM, SPEAKERPHONES, AMPLIFIERS, PAGING SPEAKERS, FLASH SWITCH ASSEMBLIES, WALL MOUNTING KITS, AND PARTS THEREOF