abrader การใช้

• Among these exhibits is a 5, 000-year-old stone abrader from Abbe's original collection.
• Shaft abraders, used to straighten spear shafts, were found at the Jurgens Site and a few other Cody complex sites.
• The stone tools found were classified into : bi-faces, uni-faces, hafted bi-faces, cores, hammer stones, choppers, used edges, and ground stone artifacts ( manos, metates and abraders ).
• In 2012, Burley and his team reported Uranium-thorium dating of a coral file ( abrader ) found at Nukuleka of 888 BC ( 2, 838 BP ), thus providing a precise date for the earliest settlement of Nukuleka.
• These tools were often purpose-made by creating a blank, either by chipping or using a technique where the slate was sawed partway through on one or both sides and then snapped into a blank, then finished by grinding with abraders or whetstones.