Valvola Standard Electric per telefonia (XX)
https://dati.museoscienza.org/lod/resource/ScientificOrTechnologicalHeritage/D-001147-1 <https://w3id.org/arco/ontology/arco/ScientificOrTechnologicalHeritage>
valvola termoionica
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Valvola Standard Electric per telefonia (XX)
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Western Electric Company
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1922 - 1925
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detenzione privata
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valvola termoionica
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Valvola per amplificatori telefonici usati in Italia dal 1922, in scatola originale sigillata.
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D-1147-1
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valvola elettronica