Dúplex telefónico - Duplex telephonic
Only 19 years after a timid introduction of telephony in Spain and seven years before the founding of the National Telephonic Company of Spain, Pascual Salmerón Gómez records his two patents: "Duplex telephonic" and "Simultaneous duplex telephonic with telegraph machines". Two hi...
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| Format: | Article |
| Language: | Spanish |
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Centro de Estudios Históricos Fray Pasqual Salmerón
2006-12-01
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| Series: | Andelma |
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| Online Access: | http://tecnologiaycultura.net/andelma/Andelma13.pdf#page=17 |