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Individual
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Priority to ES221050ApriorityCriticalpatent/ES221050A3/en
Publication of ES221050A3publicationCriticalpatent/ES221050A3/en
Improvements in the manufacture of drills that are characterized by the fact that the drills are provided with a core, lips and cutting edges of cutting metal and particularly of fast steel, added by fusion. (Machine-translation by Google Translate, not legally binding)
ES221050A1955-03-291955-03-29Improvements in the manufacture of drills (Machine-translation by Google Translate, not legally binding)
ExpiredES221050A3
(en)