peculiar to engines working with non-fuel substances or with anti-knock agents, e.g. with anti-knock fuel

Full Title

Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures (the non-fuel substances being gaseous F02D21/00) > peculiar to engines working with non-fuel substances or with anti-knock agents, e.g. with anti-knock fuel