Filters for cleaning cooling air, for engines; steamrollers; mixing machines; aeroplane engines; road sweeping machines, self-propelled; harvesting machines; carburetters; coal-cutting machines; hoists; lifting apparatus; jet engines, other than for land vehicles; road making machines; mineworking machines; engines for air cushion vehicles; compressed air engines; engines for boats; earth moving machines; cartridges for filtering machines; filters being parts of machines or engines; hydraulic engines and motors.