63 STAT.] MIt-LTILATERAL -TELECO' MI'NICATI(ONS--OCT. 2, 1947 (Chapter VII, art. 19 RR) (422-428) 422 b) However, it is recommended that, as far as pos- sible: - the call signs of coast and aeronautical stations shall consist of three letters or three letters fol- lowed by a single digit other than 0 or 1; - the call signs of fixed stations shall consist of three letters followed by two digits (other than the digits 0 and 1 in cases where they immediate- ly follow a letter). 423 c) Four letters in the case of ship stations (for ship stations using radiotelephony see 429). 424 d) Five letters in the case of aircraft stations (for aircraft stations using radiotelephony see 431). 425 e) The call sign of the parent ship or aircraft fol- lowed by two digits (other than 0 or 1), in the case of lifeboats, liferafts and other survival craft. 426 f) Four letters followed by a single digit (other than 0 or 1) in the case of mobile stations other than ship and aircraft stations (for stations of this category using radiotelephony see 433). 427 g) One or two letters and a single digit (other than 0 or 1) followed by a group of not more than three letters in the case of amateur and experi- mental stations. The prohibition of the use of the digits 0 and 1, however, does not apply to amateur stations. 428 § 6. (1) Coast stations employing radiotelephony may use as a call sign: - a call sign established in conformity with 421 and 422; 1769
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