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Objetivo zoom para proyector cinematográfico de juguete, caracterizado porque comprende entra el objetivo normal de enfoque y la imagen positiva proyectada une lente de distancie focal negativa y provistos de medios aptos para variar la distancia entre la lente de distancia focal negativa y el objetivo de enfoque.
ES1978233286U1977-01-271978-01-16Objetivo zoom para proyector cinematografico de juguete.
ExpiredES233286Y
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