Pumps as machines and as parts of machines, in particular, centrifugal pumps for processing of liquids; pump diaphragms; engines other than for land vehicles and motors other than for land vehicles, in particular, electric motors; engines for pumps and motors for pumps, in particular, electric motors; filters as parts of engines, motors and machines in the nature of pumps and filtering machines; filter housings for engines, motors and machines in the nature of pumps and filtering machines; filters, filter screens and sieves, not of metal, as inserts for filter housings for engines, motors and machines in the nature of pumps and filtering machines; filters of plastic in the form of filter candles as inserts for filter housings for engines, motors and machines in the nature of pumps and filtering machines, in particular, screen candles and wound candles; filtering machines, in particular, for filtration of liquids in the nature of acids, alkalis and mixtures thereof, solvents, alkaline degreasing baths, galvanic baths, photo chemicals, radioactive liquids, sterile liquids, precious liquids, highly corrosive liquids, liquids of low viscosity and foodstuffs; inserts and cartridges for such filtering machines; housings for engines, motors and machines in the nature of pumps and filtering machines; mechanical flow monitors for preventing dry running of pumps; control units in the nature of hydraulic and pneumatic controls for machines, engines and motors; valves as parts of machines; centrifugal pumps; devices and installations consisting entirely or mainly of the aforesaid goods, in particular, combined systems of pumps, filters and filtering machines; replacement parts for the aforesaid goods