Blowing engines for machines; oil and natural gas drilling machines; oil and natural gas drilling rigs; semi-submersible drilling rigs; drilling ships, not in the nature of vessels; jack-up drilling rigs; semi-tender drilling rigs; tender drilling rigs; derricks; oil and natural gas drilling bits; machines, namely, industrial robots; lifting and hoisting apparatus, namely, cranes; hydraulic and pneumatic controls for machines and engines

additives for earth boring and excavation fluids