Sec. 23.23  Use of frequencies for radio-telegraph communication within 
          the continental United States.

    Licensees of point-to-point radiotelegraph stations may use any 
frequency authorized in a station license for communication between 
designated points within the 48 contiguous states and the District of 
Columbia upon the express condition that the use of any frequency above 
5000 kHz shall be subject to the limitation that no interference shall 
be caused to the international service, or to service with Alaska or 
Hawaii; and in the event such interference is caused the licensee shall 
immediately discontinue the use of the frequency or frequencies 
producing such interference and operation

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thereon may be conducted only at times when such interference will not 
be caused.