Improved transmission system for hf radiotelephone circuits .
高频无线电话电路的改善的传输系统。
Technical characteristics of single-sideband equipment in the mf and hf land mobile radiotelephone service .
mf和hf陆地移动无线电话业务中的单边带设备的技术特性。
October 21 , first transmission of speech across the atlantic by radiotelephone , arlington , va. , to paris .
10月21日，无线电话横跨大西洋，从弗吉尼亚的阿林顿至巴黎，实现首次话音传输。
July 16 , world 's first radiotelephone service , between los angeles and santa catalina island , opened to the public .
7月16日，全球第一个无线电话业务，从旧金山至圣塔卡特莱那岛，正式开通。
" Provided that if a ship carries one radiotelephone operator exclusively employed for duties related to radiotelephony , it shall not be necessary to carry a second radiotelephone operator . "
