core lifter

split, internally slotted or serrated conical spring steel ring, grooves, flexible spring fingers, hinged wedge-shaped fingers or hinged flaps mounted in a carrier ring, to retain the core sample whilst the corebarrel is being hoisted from the borehole

core lifter

split, internally slotted or serrated conical spring steel ring, grooves, flexible spring fingers, hinged wedge-shaped fingers or hinged flaps mounted in a carrier ring, to retain the core sample whilst the corebarrel is being hoisted from the borehole