ES207702A1 - Sound detector device diminating telephone devices without connection with themselves (Machine-translation by Google Translate, not legally binding)
- Google Patents
Sound detector device diminating telephone devices without connection with themselves (Machine-translation by Google Translate, not legally binding)
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SANTIN MENDEZ PERFECTA
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SANTIN MENDEZ PERFECTA
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Priority to ES207702ApriorityCriticalpatent/ES207702A1/en
Publication of ES207702A1publicationCriticalpatent/ES207702A1/en
Sound pickup device emanating from telephone sets without connection to them, essentially characterized by a transformer with two windings, one primary and the other secondary with a sweet iron core conveniently placed to reinforce the lines of force. (Machine-translation by Google Translate, not legally binding)
ES207702A1953-02-111953-02-11Sound detector device diminating telephone devices without connection with themselves (Machine-translation by Google Translate, not legally binding)
ExpiredES207702A1
(en)