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BASIC TELEPHONY
About this film
Department of Defense PIN 28372 BASIC TELEPHONY 1961 ELECTRO-MAGNETIC THEORY AS APPLIED TO TELEPHONY; COMPONENTS, OPERATION AND TRANSMISSION RANGE OF SOUND POWERED, LOCAL BATTERY, AND COMMON BATTERY TELEPHONIC SYSTEM..
Directors & creators
Department of Defense
Subjects
dod.gov;public.resource.org
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