63 STAT.] Mt LTII,ATERAI-TELECOMMAINICATIONS-OCT. 2, 1947 (Chapter XIII, art. 3 RR) (792-7s ) specified in the 3rd column of appendix 3.1) These frequencies must also be used by mobile stations employing special types of wide band transmission which cannot be contained within the channels indicated by dashed lines in appendix 10. 792 § 33. For the exclusive purpose of communicating with stations of the maritime mobile service an aircraft station may be assigned one or more series of working frequencies in the passenger ship bands. These frequencies shall be assigned in accordance with the same system of uniform distribution pro- vided for passenger ships. c) Working frequencies of cargo ships. 793 § 34. Working frequencies assigned to cargo ships shall be included within the following bands: 4187 to 4238 kc/s 6 280.5 to 6357 kc/s 8374 to 8-476 kc/s 12 561 to 12 714 kc/s 16748 to 16952 kc/s 22 270 to 22 400 kc/s 794 § 35. (1) In each of the cargo ship bands the assignable fre- quencies are divided into two equal groups A and B, group A comprising the frequencies in the .lower half of the band and group B the frequencies in the upper half (see appendix 10). 795 (2) Each administration shall assign to each of its cargo ships two series of working frequencies, one in group A and the other in group B. In each band these two working fre- quencies are separated from each other by half the width of the assignable band. 796 (3) For example, if the frequency assigned to a ship station is the lowest frequency assignable in group A, the 791.1 " It is anticipated that the number of these transmitters on passenger ships will decrease progressively before the effective date of the applica- tion of the tolerances specified in column S of appendix 3. These channels will be thus gradually cleared for the use of special type of wideband transmision. 1877
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