The Year Book Of Wireless Telegraphy Telephony

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(i) When deemed necessary to exchange messages with other wireless
telegraphs concerning communications coming within the purview of Articles 22
to 24. (ii) When deemed necessary to exchange messages with other wireless
telegraphs in connection with meteorological and time signals or the adjustment
of apparatus. (iii) When rendered necessary to communicate with a telegraph
office equipped with wireless telegraph apparatus, following instructions issued
by such office.