Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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KUNCKEL HEIN
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KUNCKEL HEIN
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Application filed by KUNCKEL HEINfiledCriticalKUNCKEL HEIN
Publication of ES227630A1publicationCriticalpatent/ES227630A1/en
Portable telephone with local battery, characterized in that a transistor booster in communication with a microphone that works without a battery, can be switched to produce a call signal in an acoustic frequency generator. (Machine-translation by Google Translate, not legally binding)
ES0227630A1955-04-051956-03-28Portable phone with local battery (Machine-translation by Google Translate, not legally binding)
ExpiredES227630A1
(en)
Device for the reception and emission of voices in telephone sets without electrical procedures (Machine-translation by Google Translate, not legally binding)