63 STAT.] MULTILATERAL-TELECOMMUNICATIONS-OCT. 2, 1947 (Chapter III, art. 7, 8 RR) (26-240) 236 §2. When special circumstances make it indispensable to do so, an administration may, as an exception to the nor- mal methods of working authorized by these Regulations, have recourse to the special methods of working enumerated below, on the sole condition that the characteristics of the stations still conform to those inserted in the Master Inter- national Frequency Register: a) a fixed station may, as a secondary service, transmit to mobile stations on its normal fre- quencies; b) a land station may communicate, on a secondary basis, with fixed stations or other land stations of the same category. 237 §3. Any administration may assign a frequency in a band allocated to the fixed service to a station authorized to transmit by the unilateral method from one specified fixed point to a number of other specified fixed points, provided that such transmissions are not intended to be received di- rectly by the general public. 238 §4. Any mobile station the emission of which complies with the frequency tolerances required of coast stations may transmit on the same frequency as the coast station with which it communicates on condition that the coast station requests such transmission and that no harmful interference results to other stations. 239 §5. In certain cases, for which provision is made in articles 33 and 34, aircraft stations are authorized to use frequencies in the maritime mobile bands between 4 000 and 23 000 kc/s for the purpose of entering into communication with stations of the maritime mobile service. ARTICLE 8 Protection of Distress Frequencies 240 §1. In the band 475-535 kc/s, no class of emission capable of rendering inoperative distress, alarm, safety or 1699
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