EARTHING CARBON BRUSH ONLY ( AS PER SHEET [ EARTHING CARBON BRUSH ONLY ( AS PER SHEET NO. 10 ) AS PER CLW SPEC. NO- CLW/ ES/ 3/ 0017 ALT. D. Note: CLW approved sources shall only participate in the tender or supplier offers shall be considered with valid tender specific authorisation certificate from CLW source shall be submitted along with their offer. ]