Technology:Radio.Major E.H.Armstrong explains various amplifiers and receivers to specialists and those interested at the Columbia University.Photo; c. 1925.
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TOP17049379
Source:
達志影像
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RM
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須由TPG 完整授權
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1920S20THCENTURY2NDMILLENNIUMA.D.AMPLIFIERANTENNA(RADIO)AERIAL(RADIO)B&WCOLUMBIAUNIVERSITYCOMMUNICATIONENGINEERINGCOMMUNICATIONSERVICEE.H.ARMSTRONGEXPLAININGLANDSCAPEFORMATLESSON(SCHOOL)LOUDSPEAKERSMEDIAMASSMEDIANEWYORKCITYPHOTOGRAPHRADIORADIOBROADCASTINGRECEIVER(RADIOORTV)SOUNDENGINEERINGSTUDENT(UNIVERSITY)(MALE)STUDENTTECHNIQUETECHNOPHILIATECHNOPHILEUSA
(MALE)(RADIO(RADIO)(RADIO)(SCHOOL)(UNIVERSITY)1920S20TH2NDA.D.AERIALAMPLIFIERANTENNAARMSTRONGB&WBROADCASTINGCENTURYCITYCOLUMBIACOMMUNICATIONCOMMUNICATIONE.H.ENGINEERINGENGINEERINGEXPLAININGFORMATLANDSCAPELESSONLOUDSPEAKERSMASSMEDIAMEDIAMILLENNIUMNEWORPHOTOGRAPHRADIORADIORECEIVERSERVICESOUNDSTUDENTSTUDENTTECHNIQUETECHNOPHILETECHNOPHILIATV)UNIVERSITYUSAYORK