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ωφέλιμη ισχύς
earth.sc., transp.	actual horse-power; effective horsepower; effective output; net horsepower
el.	maximum output capacity; net output capacity; output capacity
mech.eng.	useful yield
mech.eng., el.	output; output power
transp.	revenue kilometres; net thrust

ωφέλιμη ισχύς: 6 phrases in 3 subjects

Earth sciences	1
Electronics	2
Energy industry	3