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🍺😎 " UNDERSTANDING ELECTRONICS: VACUUM TUBES " 1970 EDUCATIONAL FILM DIODES & TRIODES XD72594 https://www.youtube.com/watch?v=3lDEQNQdvB4 #PeriscopeFilm #VACUUMTUBES #History #DocuShort #Electrons #Science #Electronics #Computers #Technology #Education #Engineering #Manufacturing

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