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- being efficient, working well without waste of time or energy or other resources
Translated in 11 languages
[Subject: Automotive]
Translated by: KATRIN HELD
Translated in 6 languages
[Subject: Heating, Ventilating, Air Conditioning]
Translated in 5 languages
Translated by: SERGIO CRAGNOLINI
[Subject: Electricity & Electronics]
Translated by: SYLVIA VERGARA
Translated in 4 languages
[Subject: Generalities]
[Subject: Ecology]
Translated in 3 languages
[Subject: Economics]