| 摘要 |
<p>A debris catchment pocket 10 comprising back 12 and front 14 portions joined along a base line 50 and connected together along adjacent side edges at each end of the base line so as to form a collecting opening therebetween, the side edges being sealed along their length, leaving no unsealed gaps between the side edges and the base line. The pocket is particularly adapted for collection of debris produced during a drilling operation.</p> |
