Eighty-one beacon stations in operation over world; mobile radio beacon now being built for use on all vessels; visual indicator developed.
Radio direction finding shows remarkable growth
Mar. Eng. Shipg. Age
Marine Engineering and Shipping Age ; 33 , n 5
1928
Aufsatz (Zeitschrift)
Englisch
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Engineering Index Backfile | 1928
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Radio direction-finding apparatus
Engineering Index Backfile | 1919
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