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Publication of ES258620A3publicationCriticalpatent/ES258620A3/en
Structures Of Non-Positive Displacement Pumps
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Abstract
Improvements in the construction of fans that are essentially characterized by the fact of having two ventilation propellers attached to a common core, configuring said helices separated from each other according to convenient distance and with their radial blades provided with a helical bend that is opposite in both helices in order that the rotation of these in the same direction and at a convenient speed impel analogous air masses in two directions of opposite directions. (Machine-translation by Google Translate, not legally binding)
ES0258620AImprovements in the construction of fans (Machine-translation by Google Translate, not legally binding)
ExpiredES258620A3
(en)