Presses, punching and stamping machines, drilling machines, wood-working machines and parts of such machines which parts include pressure cylinders, valves, slide valves, silencers, nozzles; devivces for the feeding of workpieces into, and for advancing workpieces within, machine-tools, said devices being parts of machinery; devices being parts of machinery for pneumatic operation, for controlling and conditioning the properties of pressurised air used in such pneumatic machinery; electric motors; pneumatic, hydraulic and pneumatic hydraulic apparatus being machinery for controlling, feeding, braking, driving and servicing machine tools and other machines, and parts included in this class of all such apparatus