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The standard EN 792 applies to hand-held non-electric power tools driven by rotary or linear motors, powered by compressed air, hydraulic fluid and intended to be used by one operator and supported by: -- the operator's hand or hands, -- a suspension, e.g. a balancer. This part, EN 792-4, applies to non electric power tools used for chipping, riveting, breaking of concrete and asphalt, ramming etc. This part lists the significant hazards caused by such power tools and specifies safety requirements valid for different aspects of safety during their foreseeable lifetime. Power tools covered by this part of the standard: -- breakers, -- chipping hammers, -- chisels, small, -- engraving pens, -- needle scalers, -- pick hammers, -- pile drivers, -- punches, -- rammers, -- riveting hammers, -- scaling hammers, -- stone working tools, -- spades, -- tampers. Special requirements and modifications on a hand-held power tool for the purpose of mounting it in a fixture are not covered by this part. For those power tools which are driven by an internal combustion engine the particular safety requirements related to the engine are dealt with in annex C.