Filters for motors and engines, and in particular for use in vehicles of all kinds, including trucks, locomotives, ships and aeroplanes, and for stationary applications within power stations, petrol stations and in the form of emergency power generators, namely, liquid filters, gas filters, fuel filters and pre-filters, including kerosene filters and pre-filters, diesel filters and pre-filters, and vegetable oil filters and pre-filters, multistage filters, changeover filters; filter elements ...