Diamond-nondiamond carbon polycrystalline composites
Diamond/boron nitride coated excavating tool cutting insert
Differential actuating system for downhole tools
Differential array resistivity logging apparatus and method
Differential fill collar
Differential firing head
Differential flow control valve
Differential gas lift valve
Differential pressure actuated vent assembly
Differential pressure fill-up shoe
Differential pressure fluid density instrument
Differential pressure measurement systems for fluid streams
Differential pressure operated circulating and deflation valve
Differential total-gas determination while drilling
Differential valve
Differential vent and bar actuated circulating valve and method
Differentially carburized rock bit cutter
Diffuser for wellhead isolation tool
Diffusion barrier coated granules for improved hardfacing...
Digging chain support for excavation