Rotary Drill Bits Improvements 3 - cone bit (straighter hole)
{"Image DocumentName": "Rotary Drill Bits Improvements 3 - cone bit (straighter hole)", "Image ImageDescription": "Intermeshing teeth (better cleaning) Hard-facing on teeth and body. Change from water courses to jets. Tungsten carbide inserts. Sealed bearings. Journal bearings.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}