COMPONENTS AND EQUIPMENT FOR KEY TELEPHONE SYSTEMS AND HYBRID COMMUNICATION SYSTEMS BEING COMBINATIONS OF FEATURES OF KEY TELEPHONE SYSTEMS AND PRIVATE BRANCH EXCHANGES; NAMELY, KEY SERVICE TELEPHONES AND PRIVATE BRANCH EXCHANGES, KEY SERVICE AND ROTARY DIAL TELEPHONES AND PRIVATE BRANCH EXCHANGES, ARRESTER UNITS, RANDOM ACCESS MEMORIES, COMPUTER PROGRAMS, POWER SUPPLY UNITS, KEY SERVICE UNITS, AND DOOR PHONES

'access':45 'arrest':42 'branch':22,30,40 'combin':13 'communic':10 'compon':1 'comput':47 'dial':36 'door':56 'equip':3 'exchang':23,31,41 'featur':15 'hybrid':9 'key':5,17,25,32,52 'memori':46 'name':24 'phone':57 'power':49 'privat':21,29,39 'program':48 'random':44 'rotari':35 'servic':26,33,53 'suppli':50 'system':7,11,19 'telephon':6,18,27,37 'unit':43,51,54

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