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1910.219(m) Standard Guards-General Requirements
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Standard conditions shall be secured by the use of the following materials. Expanded metal, perforated or solid sheet metal, wire mesh on a frame of angle iron, or iron pipe securely fastened to floor or to frame of machine.
All metal should be free from burrs and sharp edges.
Expanded metal, sheet or perforated metal, and wire mesh shall be securely fastened to frame.