135423 ⎘
Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors; Formed core retaining or severing means mounted on pivot transverse to core axis
Method and apparatus for alternating between coring and drilling without tripping operations
#2Piston corer and method of acquiring a soil sample
#3Float valve sub
#4Coring tools including core sample flap catcher and related methods
#5Core holding system
#6Silty floating mud collection device
#7Coring tools including core sample flap catcher and related methods
#8Full closure core catcher