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1.1 This specification covers mineral oils used in hydraulic systems, where the performance requirements demand fluids with one of the following characteristics:
1.1.1 A refined base oil (Class HH).
1.1.2 A refined mineral base oil with rust and oxidation inhibitors (Class HL), and
1.1.3 A refined mineral base oil with rust and oxidation inhibitors plus antiwear characteristics (Class HM).