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Investigating Strength Of Materials By Application Of Mechanical Stress
(AREA)
Measuring Volume Flow
(AREA)
Abstract
Cuadro contador de llamadas telefónicas constituido por una placa de material y dimensiones adecuadas, cuya superficie está provista de una sucesión de orificios, ordenados en hileras de un número determinado de ellos, estando dispuestos dichos orificios, para recibir una clavija móvil que se introduce en uno de ellos y se desplaza al contiguo cada vez que se realiza la operación que es objeto de recuento.
ES0060384U1957-05-311957-05-31Cuadro contador de llamadas telefónicas
ExpiredES60384Y
(es)