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I MI'LTILATEItAL-TELE(O()MMIINICATI()NS-OCT. 2, 1947 (Chapter IV, art. 11 RR) (346349) interference, the date shall be transferred to the REGISTRA- TION COLUMN without change. 346 § 13. Should a change be made in the basic data as speci- fied in 318, recorded against a frequency assignment, the lat- ter shall be subject to new registration, the record specifying the new data and the date of their receipt by the Board. How- ever, should the Board arrive at the conclusion that the use of the frequency assignment based on the new data will not cause harmful interference with the service of a station for which a frequency assignment has been recorded, the amended assign- ment shall retain the original date of registration. Section VI. Cancellation of Frequency Recordings 347 § 14. (1) As a general rule, the Board, after consulting the notifying country, shall cancel the recording of any frequency assignment if it finds that regular operation has not begun within two years following the date of its receipt of the first notice, unless it finds that the circumstances warrant the retention of the notice, in which case the entry may be re- tained for not more than one further period of one year. 348 (2) Exceptionally, however, and only in the case of a frequency assigned to a working service for use during years of high or low sunspot activity if the frequency has not been brought into use when three years have elapsed from the date of receipt of the first notice, and the Board finds, after consul- tation with the notifying country, that the circumstances war- rant the retention of the notice, the entry may be retained for not more than one further period of three years. 349 (3) Frequencies assigned to a working service for use during years of high or low sunspot activity may be notified to the Board for any other service for use on an interim basis and without prejudice to the earlier frequency assign- ment. 1735
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