A grinder including a casing, an electric motor and optionally a transformer housed in the casing, a grinding wheel mounted outside the casing and operatively connected to the electric motor and a platform mounted on the casing to extend obliquely with respect to the axis of the grinding wheel. The platform is arranged to be used for sharpening shears and scissors by sliding a blade thereof over the upper surface of the platform while pressing the cutting edge of the blade against the grinding wheel in movement.
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