In these regulations, unless the context otherwise requires,—
fire extinguisher means any portable fire appliance which contains any liquid, gas, or other substance, or any combination of liquids or gases or other substances, and which is so designed that the contents are discharged either manually or automatically; but does not include any fire extinguisher of a kind described in the Schedule
pressurised fire extinguisher means any fire extinguisher as hereinbefore defined, containing carbon tetrachloride, methyl bromide, or chlorobromomethane, in any quantity confined under pressure; or containing any other halogenated compound in excess of 3 pounds weight confined under pressure in a single container
sale includes barter, and also includes offering or attempting to sell, or sending or delivering for sale, or causing or allowing to be sold; and to sell has a corresponding meaning.