Valves for use in wellhead apparatus; Valves operated by changes in pressure; Apparatus for use in well drilling operations; Valve closure mechanisms; Pressure valves (parts of machines); Fluid valves for industrial use (parts of machines); Shutter valves; Sludge valves being parts of machines; Regulating valves (parts of machines)

Diagnostic apparatus for scientific use; Probes for scientific purposes; Scientific equipment; Scientific instruments; Measurement apparatus for well testing; Apparatus for measuring pressure; Pressure measurement tools; Logging (recording or measuring) apparatus