ballaset synthetic diamond bit
1долото, армированное синтетическими алмазами в абразивно-устойчивой матрице — (для бурения плотных пород) [http://slovarionline.ru/anglo russkiy slovar neftegazovoy promyishlennosti/] Тематики нефтегазовая промышленность EN ballaset synthetic diamond bit …
2Hughes Christensen — Hughes Christensen, a division of Baker Hughes Inc., is a large oil and gas drill bit company. Howard Hughes, Sr. founded the company early in the 20th century. His two cone, rolling cutter rock bit whose patent was issued by the US Patent Office …
