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Priority to ES0267331ApriorityCriticalpatent/ES267331A2/en
Publication of ES267331A2publicationCriticalpatent/ES267331A2/en
Improvements introduced in the object of the Patent of invention No. 260,614 which referred to: "Improvement in sound devices by compression" characterized by having inside an enclosure an electric motor connected to a compressor and a rigid tubular channel that communicates with one or more projection elements and sound amplifiers. (Machine-translation by Google Translate, not legally binding)
ES0267331A1961-05-121961-05-12Improvements in sound compression devices (Machine-translation by Google Translate, not legally binding)
ExpiredES267331A2
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