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ES59720A1915-02-081915-02-08Un mecanismo de mando de batido por choques, particularmente aplicable a los sondeos, perforaciones y demás.
ExpiredES59720A3
(es)
Un electropulsógeno o disposición para transferir la energía eléctrica de un oscilador eléctrico a otro por medio de las excitaciones producidas por el choque.