Oil field drilling equipment and component subsystems and parts therefor, namely, drill bits, fixed cutter drill bits, and cutting elements used on drill bits including polycrystalline diamond cutting (PDC) elements and carbide cutting elements; oil field tools, namely, tools and component subsystems and component parts therefor that aid in the cutting of earthen formations including full hole bits, oil field bi-center bits, coring bits, roller cone bits, under-reamers, hole-openers, PDC cutting elements, carbide cutting elements, and stabilizers; oil field drilling services, namely, oil field coring or directional drilling services; oil field consulting services, namely engineering services, including those utilizing advanced numeric control technologies, relating to the design of components, products, processes and services related to the production and use of products that aid in the cutting of earthen formations such as drilling; and oil field repair and reconditioning services, namely the repair, restoration, refurbishing, and reconditioning of oil field drilling tools and oil field drilling equipment and the component subsystems and component parts therefor