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Breeding Of Plants And Reproduction By Means Of Culturing
(AREA)
Abstract
A paraboloid box stethoscope, characterized by the fact that its box, built of any material, preferably synthetic material, artificial resin or thermoplastic, has its hollow or excavation, forming a paraboloid of revolution, with the mouth of this box, the result of a flat section of the referred paraboloid. (Machine-translation by Google Translate, not legally binding)