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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 792-11, applies to hand-held, non-electric power tools with a reciprocating movement for nibbling and shearing. 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: -- nibblers, -- shears. 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. NOTE At the date of publication no power tools driven by internal combustion engines are known.