63 STAT.] AMULTILATERAL-TELECOIMMIUNICATIONS-OCT. 2 , 1947 1737 (Chapter IV, art. 11 RR) (3 8) 350 § 15. In case of permanent discontinuance of the use of any listed frequency, the notifying country shall inform the Board within three months of such discontinuance, whereupon the entry shall be removed from the Register. 351 § 16. If the Board finds that a recorded frequency assign- ment has been out of use for three years it shall, in agreement with the notifying country, cancel the entry in the Register except in the case of a frequency intended for re-use by a working service during years of high or low sunspot activity, in which case the entry may be retained for one further period of three years. Section VII. Studies and Recommendations 352 § 17. If it is requested by any country member of the Union and if the circumstances appear to warrant, the Board shall make a study and issue a report on the following prob- lems of frequency utilization: 353 a) in cases arising under 336 as to a possible alter- native frequency assignment to avoid probable interference; and 354 b) in cases where a need arises for additional chan- nels within a specific portion of the frequency spectrum. 355 § 18. If one or more of the interested countries so re- quest, the Board shall investigate any contravention or non- observance of these Regulations or any harmful interference and shall issue through the Secretary General of the Union a report containing its findings and recommendations for the solution of the problem. 356 § 19. If the Board finds that a change in the frequency of one or more stations will: 357 a) accommodate a new station; 358 b) facilitate the solution of an interference prob- lem; or
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