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D. If the telephone does not operate E N G L I S H SAVE THESE INSTRUCTIONS Important Safety Instructions normally by following the operating instructions. Adjust only those controls that are covered by the operating instructions. Improper adjustment may require extensive work by a qualified technician to restore the telephone to normal operation. E. If the telephone has been dropped or the case has been damaged. F. If the telephone exhibits a distinct change in performance. 15.Never install tele