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Blow bar for impactors which, for the purpose of reversibility, has a mirror-symmetrical longitudinal cross-section and features surfaces at the rear as viewed in the rotation direction of the rotor by means of which the blow bar is supported to the rear and radially from the inside against retaining pieces securely provided on the rotor, and at the front with contact surfaces for movable retaining pieces which hold the blow bar in engagement with the retaining pieces securely provided on the rotor.
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