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YLLERA SECADES JAIME
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YLLERA SECADES JAIME
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Application filed by YLLERA SECADES JAIMEfiledCriticalYLLERA SECADES JAIME
Priority to ES1978234023UpriorityCriticalpatent/ES234023Y/en
Publication of ES234023UpublicationCriticalpatent/ES234023U/en
Application grantedgrantedCritical
Publication of ES234023YpublicationCriticalpatent/ES234023Y/en
Improved screw, characterized in that in the central part of its head has a housing or slot in which alternating regularly, occupying the entire height of that housing, recesses or lobes semi-cylindrical configuration and projections or straight grooves curved bottom concavity. (Machine-translation by Google Translate, not legally binding)