Compression-ignition internal combustion piston engines (diesel or semidiesel engines):

Compression-ignition internal combustion piston engine ‘diesel or semi-diesel engine’

Compression-ignition internal combustion piston engine (diesel or semi-diesel engine)

Compression-ignition internal combustion piston engines (diesel or semidiesel engines)

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Compression-ignition internal combustion piston engine (diesel or semi-diesel engine)