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Individual
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Individual
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Priority to ES0054209UpriorityCriticalpatent/ES54209U/en
Publication of ES54209UpublicationCriticalpatent/ES54209U/en
A regulatory device for telephone conferences, characterized in that it is constituted by a double glass beaker composed of two cores joined by a thin neck that gives free access from one space to the other, and by which it is held or fixed to a retaining plate which gives it the possibility of turning so that, when inverting its position, it can spontaneously pass from one cavity to the other, the amount of powder grit located inside it; amount that is equivalent to the time of three minutes invested in moving from one place to another, in accordance with the minimum time limitation stipulated in telephone rates. (Machine-translation by Google Translate, not legally binding)
ES0054209U1956-05-121956-05-12A regulatory device for telephone conferences (Machine-translation by Google Translate, not legally binding)
PendingES54209U
(en)