ELECTRICAL COMMUNICATION APPARATUS AND ELECTRICAL COMMUNICATION SYSTEMS; NAMELY, TELEPHONES, TELEPHONE KEYSETS AND HANDSETS, TELEPHONE EXCHANGES, TELEPHONE SYSTEMS COMPRISING TELEPHONES AND REMOTE EXCHANGES, AND PARTS THEREFOR
ELECTRICAL COMMUNICATION APPARATUS AND ELECTRICAL COMMUNICATION SYSTEMS; NAMELY, TELEPHONES, TELEPHONE KEYSETS AND HANDSETS, TELEPHONE EXCHANGES, TELEPHONE SYSTEMS COMPRISING TELEPHONES AND REMOTE EXCHANGES, AND PARTS THEREFOR
ELECTRICAL COMMUNICATION APPARATUS AND ELECTRICAL COMMUNICATION SYSTEM...